Masked Shi'ite fighters hold their weapons in Al Hadidiya, south of Tikrit, en route to the Islamic State-controlled al-Alam town, where they are preparing to launch an offensive on Saturday, March 6, 2015. Iraqi government forces and Iran-backed militiamen entered a town on the southern outskirts of Saddam Hussein’s home city Tikrit on Friday, pressing on with the biggest offensive yet against Islamic State militants that seized the north last year