TOPSHOTS Shiite fighters from the Popular Mobilisation units celebrate in front of the the provincial council building inside the northern Iraqi city of Tikrit on March 31, 2015 during a military operation to retake it from the Islamic State (IS) group. Prime Minister Haider al-Abadi Prime Minister said security and allied forces backed by US-led coalition aircraft "liberated" Tikrit, 80 miles (130 kilometers) north of Baghdad, the country's biggest victory yet in the fight against IS jihadists. AFP PHOTO / STR