Free Syrian Army fighters run behind sandbags in Daraa Al-Mahata, in southern Syria, on Jan. 21. Many moderate rebels joined the uprising to fight against President Bashar Assad, but the U.S. plans to train them to fight the self-proclaimed Islamic State. Wsam Almokdad/Reuters/Landov hide caption

itoggle caption Wsam Almokdad/Reuters/Landov

Father Najeeb Michaeel shows off one of the many Christian manuscripts he saved from Iraq's Christian libraries. Alice Fordham/NPR hide caption

itoggle caption Alice Fordham/NPR

Allison Begalman, a student at the University of Southern California, wears goggles and headphones to experience a virtual mortar strike on civilians in Aleppo, Syria. James Delahoussaye/NPR hide caption

itoggle caption James Delahoussaye/NPR

A passerby watches a TV news program reporting two Japanese hostages, Kenji Goto, left, and Haruna Yukawa, held by the Islamic State group, in Tokyo, on Friday. Eugene Hoshiko/AP hide caption

itoggle caption Eugene Hoshiko/AP

Israeli Prime Minister Benjamin Netanyahu will address a joint session of Congress about Iran on March 3. The White House was not consulted on the invitation. Oded Balilty/AP hide caption

itoggle caption Oded Balilty/AP