TIKRIT, Iraq (AP) — Abdel Mowgood Hassan climbs over toppled bricks and a torn-away front door to enter his uncle's house in Tikrit, the first of his relatives to make a cautious return home since Islamic State militants were driven out. [...] while police now patrol the streets, its Sunni civilians are worried about the future, apprehensive about the Shiite militias that liberated Tikrit and fearful the Islamic State group could come back. U.S.-trained Iraqi police officers look over identification papers for all those returning to Tikrit, 130 kilometers (80 miles) north of Baghdad, wanting to stop the extremists from infiltrating this city on the banks of the Tigris River. In a brightly colored Ramadan tent at Tikrit's outskirts, men, women and children endure exhaustive bureaucracy and searches by heavily armed police. A military intelligence officer nearby, speaking on condition of anonymity as he's not authorized to brief journalists, says police arrested 11 people trying to enter the city in recent days on suspicion of being Islamic State militants, without elaborating. In a neighborhood near the Tikrit police headquarters, graffiti in Farsi reads: "Conquerors be victorious; Peace be upon the martyrs and Imam Khomeini," a reference to Iran's late supreme leader. Iraq's Sunnis long have complained of discrimination and abuse since the 2003 U.S.-led invasion that toppled Saddam's Sunni-led dictatorship and replaced it with a government dominated by the country's Shiite majority.