Antigovernment fighters brandish their guns as they ride a vehicle in Syria's northern city of Aleppo on Nov. 30. Omar Haj Kadour/AFP hide caption
Islamist fighters
Alfons R. of Hamburg, Germany (shown in this undated photo), converted to Islam at age 17. Later, he went to Turkey, then Syria, to join ISIS. He was killed this past summer. Courtesy of Manfred Karg hide caption
From German Teen To ISIS Jihadist: A Father's Struggle To Understand
Kirkuk province's Kurdish governor, Najim al-Din Omar Karim (center, wearing a bulletproof vest), listens to a commander of the Kurdish Peshmerga forces as troops are deployed on the main road between Kirkuk, Mosul and Baiji in response to the offensive by ISIS, an extremist Islamist group. Marwan Ibrahim/AFP/Getty Images hide caption
Nigerian President Goodluck Jonathan declares a state of emergency during a live broadcast on state television on Tuesday. Utomi Ekpei/AFP/Getty hide caption
NPR's Ofeibea Quist-Arcton on Nigeria's state of emergency
A French soldier battles Islamist fighters in Gao, Mali on Thursday, Feb. 21, 2013. AP hide caption