Iraqi security forces launch rockets against Islamic State extremist positions during clashes in Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq, Friday, March 27, 2015. On the ground, the Iraqi troops pressed their push in Tikrit on Friday as fighter planes pounded IS targets from above. Militants holed up in the center of Tikrit fired mortars at the military, slowing its progress despite the new aerial campaign. (AP Photo/Khalid Mohammed), APTOPIX