About 170, or 30% of released Guantanamo Bay detainees have gone on to engage in terrorist activities, and many have been Killed, died in fighting or were rearrested, says Thomas Joscelyn, an analyst at the Foundation for Defense of Democracies.
Following are five notorious Gitmo detainees:
Said al Shihri, became deputy leader of al-Qaeda in the Arabian Peninsula (AQAP) in early 2009, died in 2013 as a result of injuries from a US drone strike. Shihri was detained in Afghanistan in 2001, released from Guantanamo in 2007 and later worked as an al Qaeda travel facilitator in Iran, according to U.S. intelligence reports. (Killed)
Abu Ahmad al-Muhajir (Ibrahim bin Shakaran), a Moroccan ex-Guantanamo detainee released in 2004 who now reportedly leads a unit in Syria that fights alongside Jabhat al Nusra (al-Qaeda's official branch in Syria), was listed by the Defense Intelligence Agency in 2009 as an al-Qaeda recruiter in Iraq. (Still active)
Mohammed Mizouz, aka Abu al-Izz al-Muhajir, appeared in a video alongside fighters from both Islamic State of Iraq and ash-Sham and Jabhat al-Nusra in Latakia, where he gave a speech promoting unity among the mujahideen. He was detained in Pakistan in 2001 and released from Guantanamo in 2004. (Still active)
Ibrahim Suleiman al Rubaish, captured in 2001 by Pakistani authorities and held in Guantanamo until 2006, later became an important theologian for al-Qaeda in the Arabian Peninsula, providing theological justifications for its acts of terrorism, and calling for assassinations of Saudi royals. (Still active)
Abdullah Ghulam Rasoul, aka Mullah Abdullah Zakir,captured in Afghanistan in 2001 and released from Guantanamo in 2007, later became the Taliban's chief operations officer in southern Afghanistan. (Still Active)
Sources: Thomas Joscelyn, Aymenn Jawad Al-Tamimi, USA TODAY research