Shiite fighters fire a rocket during clashes with ISIS militants in Iraq's Salahuddin province on March 1, 2015. Thousands of Iraqi soldiers and Shiite militiamen sought to seal off ISIS in Tikrit and nearby towns.

Shiite fighters fire a rocket during clashes with ISIS militants in Iraq's Salahuddin province on March 1, 2015. Thousands of Iraqi soldiers and Shiite militiamen sought to seal off ISIS in Tikrit and nearby towns.

Credit:

Ahmed Al-Hussaini/Reuters

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