Stun grenade

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Stun grenade
TypeLess-than-lethal explosive device

A stun bomb, also known as a flash grenade, flashbang, thunderflash or sound bomb,[1] is a less-lethal explosive device used to temporarily disorient an enemy's senses. It is designed to produce a blinding flash of light of around 7 megacandela (Mcd) and an intensely loud "bang" of greater than 170 decibels (dB).[2] It was first used by the British Army's Special Air Service in the late 1970s.[3]

The flash temporarily activates all photoreceptor cells in the eye, blinding it for approximately five seconds. Afterward, victims perceive an afterimage which impairs their vision. The sheer volume of the detonation also causes temporary deafness in the victim and also disturbs the fluid in the ear, causing a loss of balance.

The concussive blast still has the ability to cause injuries, and the heat created may ignite flammable materials. The fires that occurred during the Iranian Embassy siege in London were caused by stun grenades coming into contact with flammable objects.


British technical experts created the first "flash bang" or "stun" grenade for the Special Air Service's Counter terrorist wing.[4]

Unlike a fragmentation grenade, stun grenades are constructed with a casing made to remain intact during deflagration and avoiding fragmentation injuries, while having large circular cutouts to allow the light and sound of the explosion through. The filler consists of a pyrotechnic metal-oxidant mix of magnesium or aluminium and an oxidizer such as potassium perchlorate or potassium nitrate.


While stun grenades are designed to limit injury to their targets, permanent hearing loss has been reported.[5][6] Other injuries and deaths have also been caused by their use, usually when a grenade detonated close to a person, or due to structure fires caused by detonation. These include the following:

List of incidents[edit]

  • In 1989, police in Minneapolis, Minnesota, conducted a drug raid at the home of an elderly couple, Lloyd Smalley and Lillian Weiss, after receiving inaccurate information from an informant. The stun grenades police used in the raid set the home on fire. Police said they were certain no one was inside, and so, at first, made no attempt at rescue. Smalley and Weiss died of smoke inhalation.[7][8][9][10][11]
  • In May 2003, a woman named Alberta Spruill died from a heart attack after a police team detonated a stun grenade at her residence in Harlem, New York while looking for a drug dealer who was already in police custody. Her family eventually won a $1.6 million civil suit against the city.[12]
  • In February 2010, police in Minneapolis, Minnesota, raided the apartment of Rickia Russell looking for drugs. While Russell was eating dinner with her boyfriend, the police threw a stun grenade after breaching the door. The exploding stun grenade gave Rickia 3rd degree burns on both calves and burns to her head. No drugs were found in Russell's apartment and the Minneapolis City Council agreed to pay $1 million in damages.[13]
  • In January 2011, a California man named Rogelio Serrato died of smoke inhalation after a stun grenade launched by a police SWAT team ignited a fire in his home.[14] The man was believed to have been hiding in the attic when the fire broke out.[15]
  • In February 2011, a North Carolina SWAT police officer was injured at his home when a stun grenade accidentally detonated while he was attempting to secure his equipment. He underwent emergency surgery, but later died of his injuries.[16]
  • On 15 June 2011, during an anti-austerity prostest in Athens, journalist Manolis Kypraios was hit with a stun grenade by the police, which resulted in permanent loss of hearing.[17]
  • On 28 May 2014, a 19-month-old baby boy's face was severely burned and mutilated when a stun grenade was thrown into his playpen by a SWAT team serving an arrest warrant for a suspected drug dealer in Cornelia, Georgia. The baby survived with facial disfigurement.[18] The family received $3.6 million in settlements in 2016.[19]
  • On 3 August 2014, a fan of the FK Vardar football team was seriously injured during a football match after trying to throw a stun grenade used by police when a fight between the police and the fans broke out in the stands of Stadion Tumbe Kafe stadium in Bitola. The grenade exploded in his hand causing him to lose two fingers and suffer severe damage to his arm.[20]
  • In August 2018, Michelle Fawcett suffered severe chemical burns and other injuries when a stun grenade was fired into a crowd of protesters in Portland, Oregon and struck her on the arm.[21]
  • In October 2019, a 19-year-old undergraduate student suffered a severe head injury when a stun grenade was fired into a crowd of protesters outside the Greek Parliament in Athens by police.[22]
  • On 14 November 2019, a protestor in Baghdad died in a hospital from wounds resulting from a stun grenade thrown into a crowd of protesters during a clash with Iraqi authorities.[23]


  1. ^ "Drugs raid recovers tonnes of cocaine and marijuana in Chile". September 3, 2014. Archived from the original on September 4, 2014.
  2. ^ "Measurement of Exposure to Impulsive Noise at Indoor and Outdoor Firing Ranges during Tactical Training Exercises" (PDF). Retrieved 2013-08-25.
  3. ^ "SAS - Weapons - Flash Bang | Stun Grenade". Retrieved 2013-05-29.
  4. ^ Bonneville, Leigh, The SAS 1983-2014 (Elite), Osprey Publishing, 2016, ISBN 1472814037 ISBN 978-1472814036, p.9
  5. ^
  6. ^ Hambling, David (August 6, 2009). "Military Still Trying to Replace Dangerous Stun Grenades" – via
  7. ^[permanent dead link]
  8. ^ Karren Mills, "City Image Tarnished By Allegations of Police Racism," Associated Press, March 21, 1989. Google News
  9. ^ David Chanen, "Police device used in search is considered safe, official says," Minneapolis Star Tribune, March 17, 2000, p. 7B.
  10. ^ The case is also cited in "Botched Police Raids not so rare" Google News Archived 2017-03-13 at the Wayback Machine
  11. ^ The case is also cited in “Botched raid costs Minneapolis $1 million”, Star Tribune December 9, 2011 Star Tribune
  12. ^ Shaila K. Dewan (2003-10-29). "City to Pay $1.6 Million in Fatal, Mistaken Raid". The New York Times. Retrieved 2013-05-29.
  13. ^ Carlyle, Erin (2011-12-10). "Rickia Russell wins $1 million police brutality settlement after burns from a stun grenade". City Pages. Archived from the original on 2014-10-13. Retrieved 2014-10-07.
  14. ^ Gratz, Matt (2011-07-26). "California SWAT burns innocent man to death with flash-bang stun grenade". Political Fail Blog. Archived from the original on 2013-04-26. Retrieved 2013-05-29.
  15. ^ "Rogelio Serrato died in a fire during the Jan. 5 raid in the 200 block of San Antonio Drive". Retrieved 2013-05-29.
  16. ^ "NC SWAT officer killed when stun grenade detonates". February 26, 2011 – via
  17. ^ "Μανώλης Κυπραίος: Δικαιώθηκε ο ρεπόρτερ που έχασε την ακοή του από κρότου-λάμψης".
  18. ^ "Toddler critically injured by 'flash bang' during police search". 2014-05-29. Retrieved 2014-05-30.
  19. ^ AMBER ARNOLD (2016-03-01). "Family of baby injured during raid awarded $3.6 million". Associated Press, State Journal. Retrieved 2019-08-01.
  20. ^ "Macedonia: Fan nearly lost hand after police throw grenade in the away sector". 2014-08-03. Archived from the original on 2014-08-05. Retrieved 2014-08-03.
  21. ^ Wilson, Jason (5 August 2019). "Woman says she was permanently disfigured by Portland police at protest". The Guardian. Retrieved 5 August 2019.
  22. ^ "Student rally episodes and chemicals - A flash-hit head injury". ThePressProject. 24 October 2019. Retrieved 24 October 2019.
  23. ^ "4 killed, dozens wounded in clashes against security forces - Iraq News - Local News - Baghdadpost". November 14, 2019.

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