An Iraqi Turkmen fighter looks at an icon of seventh century Imam Ali bin Abi Talib, Islam's fourth caliph and cousin and son-in-law of Prophet Muhammad, in Taza Khormato, Iraq, earlier this month. Karim Sahib/AFP/Getty Images hide caption

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The Iraqi prime minister's security spokesman, Lt. Gen. Qassem Atta, holds a press conference on Saturday in Baghdad. The government is launching an offensive against insurgents in the northern city of Tikrit. Ahmad al-Rubaye/AFP/Getty Images hide caption

itoggle caption Ahmad al-Rubaye/AFP/Getty Images

This image posted on a militant website shows ISIS fighters marching in Raqqa, Syria, where the extremist group trains recruits, including Westerners. AP hide caption

itoggle caption AP

Libya's Gen. Khalifa Hifter speaks at a news conference in Abyar, a small town to the east of Benghazi, on May 31. Hifter, a former military officer in Moammar Gadhafi's army, has has launched a self-declared campaign against Muslim extremists. This has won him both supporters and enemies. Esam Omran Al-Fetori/Reuters/Landov hide caption

itoggle caption Esam Omran Al-Fetori/Reuters/Landov