This image posted by the Raqqa Media Center of the Islamic State group, a militant extremist group, which has been authenticated based on its contents and other AP reporting, shows members of the Islamic State group with a captured pilot, center, wearing a white shirt in Raqqa, Syria, Wednesday, Dec. 24, 2014. Activists say that Islamic State fighters have shot down a warplane believed to be from the U.S.-led coalition over Syria. (AP Photo/Raqqa Media Center of the Islamic State group)