Head of the Badr Organisation Hadi al-Amiri (R) uses a handheld radio in the town of Hamrin in Salahuddin province March 3, 2015. Thousands of Iraqi soldiers and Shi'ite militiamen sought to seal off Islamic State fighters in Tikrit and nearby towns on Tuesday, the second day of Iraq's biggest offensive yet against a stronghold of the Sunni militants. REUTERS/Thaier Al-Sudani (IRAQ - Tags: POLITICS CIVIL UNREST CONFLICT MILITARY)