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New recruits training under the authority of Abdul Rehman, allegedly part of the Lashkar-e-Taiba Islamist militant group, Mattani, Pakistan, December 22, 2009.(Veronique de Viguerie/Getty Images)

Members of the jihadist group Al-Nusra Front fire homemade mortar rounds during fighting with government forces on February 8, 2014 in the Syrian village of Aziza, on the southern outskirts of Aleppo. (BARAA AL-HALABI/AFP/Getty Images)

Yemeni soldiers watching a funeral for policemen killed by a car bombing in Sanaa, January 9, 2015 (Mohammed Huwais/AFP/Getty Images).

Iraqi demonstrators shout slogans during an anti-government protest in the western city of Ramadi on March 15, 2013. (AZHAR SHALLAL/AFP/Getty Images)

Iraqi demonstrators shout slogans during an anti-government protest in the western city of Ramadi on March 15, 2013. (AZHAR SHALLAL/AFP/Getty Images)

Iraqi demonstrators shout slogans during an anti-government protest in the western city of Ramadi on March 15, 2013. (AZHAR SHALLAL/AFP/Getty Images)

Uighur people (C) walk near police as they form a line across a street on July 8, 2009 in Urumqi, China. (Guang Niu/Getty Images)