This undated image posted on a militant website on Tuesday, January 14, 2014, shows fighters from the Al-Qaida-affiliated Islamic State of Iraq and Syria (ISIS) marching in Raqqa, Syria. (AP Photo/militant website)
This undated image posted on a militant website on Tuesday, January 14, 2014, shows fighters from the Al-Qaida-affiliated Islamic State of Iraq and Syria (ISIS) marching in Raqqa, Syria. (AP Photo/militant website)