Juveniles held at the Guantanamo Bay detention camp numbered fifteen, according to a 2011 study by the University of California Davis. The U.S. State Department had publicly acknowledged twelve. The US Department of Defense defined minors at Guantanamo as those below the age of 16, whereas they are defined as below the age of 18 in international law. Three juveniles aged below 16 were held in Camp Iguana, but others between 16 and 18 were put into the general population and treated as adults. These included Omar Khadr, a Canadian citizen who was 15 when captured and one of the youngest detainees, 16 when transported to Guantanamo.