Nuclear terrorism denotes the detonation of a yield-producing nuclear bomb containing fissile material by terrorists. Some definitions of nuclear terrorism include the sabotage of a nuclear facility and/or the detonation of a radiological device, colloquially termed a dirty bomb, but consensus is lacking. In legal terms, nuclear terrorism is an offense committed if a person unlawfully and intentionally “uses in any way radioactive material … with the intent to cause death or serious bodily injury; or with the intent to cause substantial damage to property or to the environment; or with the intent to compel a natural or legal person, an international organization or a State to do or refrain from doing an act”, according to the 2005 United Nations International Convention for the Suppression of Acts of Nuclear Terrorism.
The possibility of terrorist organizations using nuclear weapons (especially very small ones, such as suitcase nukes) has been a threat in American rhetoric and culture. It is considered plausible that terrorists could acquire a nuclear weapon. In 2011, the British news agency, the Telegraph, received leaked documents regarding the Guantanamo Bay interrogations of Khalid Sheikh Mohammed. The documents cited Khalid saying that, if Osama bin Laden is captured or killed by the Coalition of the Willing, an al-Qaeda sleeper cell will detonate a "weapon of mass destruction" in a "secret location" in Europe, and promised it would be "a nuclear hellstorm".  However despite some reported thefts and trafficking of small quantities of fissile material, all low concern less than category III Special nuclear material(< Cat III SNM) quantities, there is therefore no credible evidence that any terrorist group has ever succeeded in obtaining Category I SNM/the necessary multi-kilogram critical mass quantities of weapons grade plutonium, required to make a nuclear weapon.
Nuclear terrorism could include:
- Acquiring or fabricating a nuclear weapon
- Fabricating a dirty bomb
- Attacking a nuclear reactor, e.g., by disrupting critical inputs (e.g. water supply)
- Attacking or taking over a nuclear-armed submarine, plane or base.
Nuclear terrorism, according to a 2011 report published by the Belfer Center for Science and International Affairs at Harvard University, can be executed and distinguished via four pathways:
- The use of a nuclear weapon that has been stolen or purchased on the black market
- The use of a crude explosive device built by terrorists or by nuclear scientists who the terrorist organization has furtively recruited
- The use of an explosive device constructed by terrorists and their accomplices using their own fissile material
- The acquisition of fissile material from a nation-state.
U.S. President Barack Obama calls nuclear terrorism "the single most important national security threat that we face". In his first speech to the U.N. Security Council, President Obama said that "Just one nuclear weapon exploded in a city -- be it New York or Moscow, Tokyo or Beijing, London or Paris -- could kill hundreds of thousands of people". It would "destabilize our security, our economies, and our very way of life".
As early as December 1945, politicians worried about the possibility of smuggling nuclear weapons into the United States, though this was still in the context of a battle between the superpowers of the Cold War. Congressmen quizzed the "father of the atomic bomb," J. Robert Oppenheimer, about the possibility of detecting a smuggled atomic bomb:
Sen. Millikin: We... have mine-detecting devices, which are rather effective... I was wondering if anything of that kind might be available to use as a defense against that particular type of use of atomic bombs.
Dr. Oppenheimer: If you hired me to walk through the cellars of Washington to see whether there were atomic bombs, I think my most important tool would be a screwdriver to open the crates and look. I think that just walking by, swinging a little gadget would not give me the information.
This sparked further work on the question of smuggled atomic devices during the 1950s.
Discussions of non-state nuclear terrorism among experts go back at least to the 1970s. In 1975 The Economist warned that "You can make a bomb with a few pounds of plutonium. By the mid-1980s the power stations may easily be turning out 200,000 lb of the stuff each year. And each year, unless present methods are drastically changed, many thousands of pounds of it will be transferred from one plant to another as it proceeds through the fuel cycle. The dangers of robbery in transit are evident.... Vigorous co-operation between governments and the International Atomic Energy Agency could, even at this late stage, make the looming perils loom a good deal smaller." And the New York Times commented in 1981 that The Nuclear Emergency Search Team's "origins go back to the aftershocks of the Munich Olympic massacre in mid-1972. Until that time, no one in the United States Government had thought seriously about the menace of organized, international terrorism, much less nuclear terrorism. There was a perception in Washington that the value of what is called 'special nuclear material' - plutonium or highly enriched uranium (HEU) - was so enormous that the strict financial accountability of the private contractors who dealt with it would be enough to protect it from falling into the wrong hands. But it has since been revealed that the physical safeguarding of bomb-grade material against theft was almost scandalously neglected."
This discussion took on a larger public character in the 1980s after NBC aired Special Bulletin, a television dramatization of a nuclear terrorist attack on the United States. In 1986 a private panel of experts known as the International Task Force on the Prevention of Terrorism released a report urging all nuclear-armed states to beware the dangers of terrorism and work on equipping their nuclear arsenals with permissive action links. "The probability of nuclear terrorism," the experts warned, "is increasing and the consequences for urban and industrial societies could be catastrophic."
The World Institute for Nuclear Security is an organization which seeks to prevent nuclear terrorism and improve world nuclear security. It works alongside the International Atomic Energy Agency. WINS was formed in 2008, less than a year after a break-in at the Pelindaba nuclear facility in South Africa, which contained enough enriched uranium to make several nuclear bombs.
The Global Initiative to Combat Nuclear Terrorism (GICNT) is an international partnership of 83 nations and 4 official observers working to improve capacity on a national and international level for prevention, detection, and response to a nuclear terrorist event. Partners join the GICNT by endorsing the Statement of Principles, a set of broad nuclear security objectives. GICNT partner nations organize and host workshops, conferences, and exercises to share best practices for implementing the Statement of Principles. The GICNT also holds Plenary meetings to discuss improvements and changes to the partnership.
Nuclear weapons materials on the black market are a global concern, and there is concern about the possible detonation of a small, crude nuclear weapon by a militant group in a major city, with significant loss of life and property.
It is feared that a terrorist group could detonate a radiological or "dirty bomb." A "dirty bomb" is composed of any radioactive source and a conventional explosive. The radioactive material is dispersed by the detonation of the explosive. Detonation of such a weapon is not as powerful as a nuclear blast, but can produce considerable radioactive fallout. There are other radiological weapons called radiological exposure devices where an explosive is not necessary. A radiological weapon may be very appealing to terrorist groups as it is highly successful in instilling fear and panic amongst a population (particularly because of the threat of radiation poisoning), and would contaminate the immediate area for some period of time, disrupting attempts to repair the damage and subsequently inflicting significant economic losses.
According to leaked diplomatic documents, al-Qaeda can produce radiological weapons, after sourcing nuclear material and recruiting rogue scientists to build "dirty bombs". Al-Qaeda, along with some North Caucasus terrorist groups that seek to establish an Islamic Caliphate in Russia, have consistently stated they seek nuclear weapons and have tried to acquire them. Al-Qaeda has sought nuclear weapons for almost two decades by attempting to purchase stolen nuclear material and weapons and has sought nuclear expertise on numerous occasions. Osama bin Laden has stated that the acquisition of nuclear weapons or other weapons of mass destruction is a “religious duty.” While pressure from a wide range of counter-terrorist activity has hampered Al-Qaeda’s ability to manage such a complex project, there is no sign that it has jettisoned its goals of acquiring fissile material. Statements made as recently as 2008 indicate that Al-Qaeda’s nuclear ambitions are still very strong.
North Caucasus terrorists have attempted to seize a nuclear submarine armed with nuclear weapons. They have also engaged in reconnaissance activities on nuclear storage facilities and have repeatedly threatened to sabotage nuclear facilities. Similar to Al-Qaeda, these groups’ activities have been hampered by counter-terrorism activity; nevertheless they remain committed to launching such a devastating attack within Russia.
The Japanese terror cult Aum Shinrikyo, which used nerve gas to attack a Tokyo subway in 1995, has also tried to acquire nuclear weapons. However, according to nuclear terrorism researchers at Harvard University’s Belfer Center for Science and International Affairs, there is no evidence that they continue to do so.
Incidents involving nuclear material
Information reported to the International Atomic Energy Agency (IAEA) shows "a persistent problem with the illicit trafficking in nuclear and other radioactive materials, thefts, losses and other unauthorized activities". The IAEA Illicit Nuclear Trafficking Database notes 1,266 incidents reported by 99 countries over the last 12 years, including 18 incidents involving HEU or plutonium trafficking:
- There have been 18 incidences of theft or loss of highly enriched uranium (HEU) and plutonium confirmed by the IAEA.
- Security specialist Shaun Gregory argued in an article that terrorists have attacked Pakistani nuclear facilities three times in the recent past; twice in 2007 and once in 2008.
- In November 2007, burglars with unknown intentions infiltrated the Pelindaba nuclear research facility near Pretoria, South Africa. The burglars escaped without acquiring any of the uranium held at the facility.
- In June 2007, the Federal Bureau of Investigation released to the press the name of Adnan Gulshair el Shukrijumah, allegedly the operations leader for developing tactical plans for detonating nuclear bombs in several American cities simultaneously.
- In November 2006, MI5 warned that al-Qaida were planning on using nuclear weapons against cities in the United Kingdom by obtaining the bombs via clandestine means.
- In February 2006, Oleg Khinsagov of Russia was arrested in Georgia, along with three Georgian accomplices, with 79.5 grams of 89 percent HEU.
- The Alexander Litvinenko poisoning with radioactive polonium "represents an ominous landmark: the beginning of an era of nuclear terrorism," according to Andrew J. Patterson.
- In June 2002, U.S. citizen José Padilla was arrested for allegedly planning a radiological attack on the city of Chicago; however, he was never charged with such conduct. He was instead convicted of charges that he conspired to "murder, kidnap and maim" people overseas.
After several incidents in Pakistan in which terrorists attacked three of its military nuclear facilities, it became clear that there emerged a serious danger that they would gain access to the country’s nuclear arsenal, according to a journal published by the US Military Academy at West Point. In January 2010, it was revealed that the US army was training a specialised unit "to seal off and snatch back" Pakistani nuclear weapons in the event that militants would obtain a nuclear device or materials that could make one. Pakistan supposedly possesses about 80 nuclear warheads. US officials refused to speak on the record about the American safety plans.
A study by Belfer Center for Science and International Affairs at Harvard University titled "Securing the Bomb 2010," found that Pakistan's stockpile "faces a greater threat from Islamic extremists seeking nuclear weapons than any other nuclear stockpile on earth."
According to Rolf Mowatt-Larssen, a former investigator with the CIA and the US Department of Energy, there is "a greater possibility of a nuclear meltdown in Pakistan than anywhere else in the world. The region has more violent extremists than any other, the country is unstable, and its arsenal of nuclear weapons is expanding."
Nuclear weapons expert David Albright and author of "Peddling Peril" has also expressed concerns that Pakistan's stockpile may not be secure despite assurances by both Pakistan, U.S. and South-east Asia government. He stated that Pakistan "has had many leaks from its program of classified information and sensitive nuclear equipment, and so you have to worry that it could be acquired in Pakistan," 
A 2010 study by the Congressional Research Service titled 'Pakistan’s Nuclear Weapons: Proliferation and Security Issues' noted that even though Pakistan had taken several steps to enhance nuclear security in recent years, "instability in Pakistan has called the extent and durability of these reforms into question."
President Barack Obama has reviewed Homeland Security policy and concluded that "attacks using improvised nuclear devices ... pose a serious and increasing national security risk". In their presidential contest, President George W. Bush and Senator John Kerry both agreed that the most serious danger facing the United States is the possibility that terrorists could obtain a nuclear bomb. Most nuclear-weapon analysts agree that "building such a device would pose few technological challenges to reasonably competent terrorists". The main barrier is acquiring highly enriched uranium.
In 2004, Graham Allison, U.S. Assistant Secretary of Defense during the Clinton administration, wrote that “on the current path, a nuclear terrorist attack on America in the decade ahead is more likely than not". In 2004, Bruce Blair, president of the Center for Defense Information stated: "I wouldn't be at all surprised if nuclear weapons are used over the next 15 or 20 years, first and foremost by a terrorist group that gets its hands on a Russian nuclear weapon or a Pakistani nuclear weapon". In 2006, Robert Galluccii, Dean of the Georgetown University School of Foreign Service, estimated that, “it is more likely than not that al-Qaeda or one of its affiliates will detonate a nuclear weapon in a U.S. city within the next five to ten years." Despite a number of claims, there is no credible evidence that any terrorist group has yet succeeded in obtaining a nuclear bomb or the materials needed to make one.
Detonation of a nuclear weapon in a major U.S. city could kill more than 500,000 people and cause more than a trillion dollars in damage. Hundreds of thousands could die from fallout, the resulting fires and collapsing buildings. In this scenario, uncontrolled fires would burn for days and emergency services and hospitals would be completely overwhelmed. The likely socio-economic consequences in the United States outside the immediate vicinity of an attack, and possibly in other countries, would also likely be far-reaching. A Rand Corporation report speculates that there may be an exodus from other urban centers by populations fearful of another nuclear attack.
The Obama administration will focus on reducing the risk of high-consequence, non-traditional nuclear threats. Nuclear security is to be strengthened by enhancing "nuclear detection architecture and ensuring that our own nuclear materials are secure," and by "establishing well-planned, well-rehearsed, plans for co-ordinated response." According to senior Pentagon officials, the United States will make "thwarting nuclear-armed terrorists a central aim of American strategic nuclear planning." Nuclear attribution is another strategy being pursued to counter terrorism. Led by the National Technical Nuclear Forensics Center, attribution would allow the government to determine the likely source of nuclear material used in the event of a nuclear attack. This would prevent terrorist groups, and any states willing to help them, from being able to pull off a covert attack without assurance of retaliation.
In July 2010 medical personnel from the U.S. Army practiced the techniques they would use to treat people injured by an atomic blast. The exercises were carried out at a training center in Indiana, and were set up to "simulate the aftermath of a small nuclear bomb blast, set off in a U.S. city by terrorists."
After 9/11, it would seem prudent for nuclear power plants to be prepared for an attack by a large, well-armed terrorist group. But the Nuclear Regulatory Commission, in revising its security rules, decided not to require that plants be able to defend themselves against groups carrying sophisticated weapons. According to a study by the Government Accountability Office, the N.R.C. appeared to have based its revised rules "on what the industry considered reasonable and feasible to defend against rather than on an assessment of the terrorist threat itself". If terrorist groups could sufficiently damage safety systems to cause a core meltdown at a nuclear power plant, and/or sufficiently damage spent fuel pools, such an attack could lead to widespread radioactive contamination. The Federation of American Scientists have said that if nuclear power use is to expand significantly, nuclear facilities will have to be made extremely safe from attacks that could release massive quantities of radioactivity into the community. New reactor designs have features of passive safety, which may help. In the United States, the NRC carries out "Force on Force" (FOF) exercises at all Nuclear Power Plant (NPP) sites at least once every three years.
Various acts of civil disobedience since 1980 by the peace group Plowshares have shown how nuclear weapons facilities can be penetrated, and the groups actions represent extraordinary breaches of security at nuclear weapons plants in the United States. The National Nuclear Security Administration has acknowledged the seriousness of the 2012 Plowshares action. Non-proliferation policy experts have questioned "the use of private contractors to provide security at facilities that manufacture and store the government's most dangerous military material".
The Cooperative Threat Reduction Program (CTR), which is also known as the Nunn–Lugar Cooperative Threat Reduction, is a 1992 law sponsored by Senators Sam Nunn and Richard Lugar. The CTR established a program that gave the U.S. Department of Defense a direct stake in securing loose fissile material inside the since-dissolved USSR. According to Graham Allison, director of Harvard University's Belfer Center for Science and International Affairs, this law is a major reason why not a single nuclear weapon has been discovered outside the control of Russia’s nuclear custodians.
In August 2002, the United States launched a program to track and secure enriched uranium from 24 Soviet-style reactors in 16 countries, in order to reduce the risk of the materials falling into the hands of terrorists or "rogue states". The first such operation was Project Vinca, "a multinational, public-private effort to remove nuclear material from a poorly-secured Yugoslav research institute." The project has been hailed as "a nonproliferation success story" with the "potential to inform broader 'global cleanout' efforts to address one of the weakest links in the nuclear nonproliferation chain: insufficiently secured civilian nuclear research facilities."
In 2004, the U.S. Global Threat Reduction Initiative (GTRI) was established in order to consolidate nuclear stockpiles of highly enriched uranium (HEU), plutonium, and assemble nuclear weapons at fewer locations. Additionally, the GTRI converted HEU fuels to low-enriched uranium (LEU) fuels, which has prevented their use in making a nuclear bomb. HEU that has not been converted to LEU has been shipped back to secure sites, while amplified security measures have taken hold around vulnerable nuclear facilities.
Robert Gallucci, President of the John D. and Catherine T. MacArthur Foundation, argues that traditional deterrence is not an effective approach toward terrorist groups bent on causing a nuclear catastrophe. Henry Kissinger, stating the wide availability of nuclear weapons makes deterrence “decreasingly effective and increasingly hazardous.” Preventive strategies, which advocate the elimination of an enemy before it is able to mount an attack, are risky and controversial, therefore difficult to implement. Gallucci believes that “the United States should instead consider a policy of expanded deterrence, which focuses not on the would-be nuclear terrorists but on those states that may deliberately transfer or inadvertently lead nuclear weapons and materials to them. By threatening retaliation against those states, the United States may be able to deter that which it cannot physically prevent.”.
Graham Allison makes a similar case, arguing that the key to expanded deterrence is coming up with ways of tracing nuclear material to the country that forged the fissile material. “After a nuclear bomb detonates, nuclear forensic cops would collect debris samples and send them to a laboratory for radiological analysis. By identifying unique attributes of the fissile material, including its impurities and contaminants, one could trace the path back to its origin.” The process is analogous to identifying a criminal by fingerprints. “The goal would be twofold: first, to deter leaders of nuclear states from selling weapons to terrorists by holding them accountable for any use of their own weapons; second, to give leader every incentive to tightly secure their nuclear weapons and materials.”
John Mueller, a scholar of international relations at the Ohio State University, is a prominent nuclear skeptic. He makes three claims: (1) the nuclear intent and capability of terrorist groups such as Al Qaeda has been “fundamentally exaggerated;” (2) “the likelihood a terrorist group will come up with an atomic bomb seems to be vanishingly small;” and (3) policymakers are guilty of an “atomic obsession” that has led to “substantively counterproductive” policies premised on “worst case fantasies.” In his book Atomic Obsession: Nuclear Alarmism from Hiroshima to Al-Qaeda he argues that: "anxieties about terrorists obtaining nuclear weapons are essentially baseless: a host of practical and organizational difficulties make their likelihood of success almost vanishingly small".
Intelligence officials have pushed back, testifying before Congress that the inability to recognize the shifting modus oparandi of terrorist groups was part of the reason why members of Aum Shinrikyo, for example, were “not on anybody’s radar screen.” Matthew Bunn, associate professor at Harvard University's John F. Kennedy School of Government, argues that “Theft of HEU and plutonium is not a hypothetical worry, it is an ongoing reality." Almost all of the stolen HEU and plutonium that has been seized over the years had never been missed before it was seized. The IAEA Illicit Nuclear Trafficking Database notes 1,266 incidents reported by 99 countries over the last 12 years, including 18 incidents involving HEU or plutonium trafficking.
On April 12–13, 2010, President of the United States Barack Obama initiated and hosted the first-ever nuclear security summit in Washington D.C., commonly known as the Washington Nuclear Security Summit. The goal was to strengthen international cooperation to prevent nuclear terrorism. President Obama, along with nearly fifty world leaders, discussed the threat of nuclear terrorism, what steps needed to be taken to mitigate illicit nuclear trafficking, and how to secure nuclear material. The Summit was successful in that it produced a consensus delineating nuclear terrorism as a serious threat to all nations. Finally, the Summit produced over four-dozen specific actions embodied in commitments by individual countries and the Joint Work Plan. However, world leaders at the Summit failed to agree on baseline protections for weapons-usable material, and no agreement was reached on ending the use of highly enriched uranium (HEU) in civil nuclear functions. Many of the shortcomings of the Washington Nuclear Security Summit were addressed at the Seoul Nuclear Security Summit in March 2012.
According to Graham Allison, director of Harvard University’s Belfer Center for Science and International Affairs, the objectives of the Nuclear Security Summit in Seoul are to continue to, “assess the progress made since the Washington Summit and propose additional cooperation measures to (1) Combat the threat of nuclear terrorism, (2) protect nuclear materials and related facilities, and (3) prevent illicit trafficking in nuclear materials."
- The Apollo Affair - the possible theft of HEU from the US' NUMEC facility by Israeli agents.
- Atomic spies
- List of crimes involving radioactive substances
- Lists of nuclear disasters and radioactive incidents
- Nuclear espionage
- The World Institute for Nuclear Security
- Vulnerability of nuclear plants to attack
- Weapons of mass destruction
- Nuclear warfare
- Guantanamo Bay files leak
- 2014 Nuclear Security Summit
- International Project - Forum «Nuclear Security – Counteraction Measures to Acts of Nuclear Terrorism»
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- Annotated bibliography, Alsos Digital Library for Nuclear Issues
- Fallout: After a Nuclear Attack - slideshow by Life magazine
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