Islamic State militants attacked government forces and their Shi’ite militia allies on Saturday, killing 11 near the city of Baiji as part of the battle for control of Iraq’s biggest refinery, army and police sources said. Four suicide bombers in vehicles packed with explosives hit security forces and the local headquarters of the Shi’ite militias in the area of al-Hijjaj, 10 km (6 miles) to the south of Baiji town, near the refinery, sources at the nearby Tikrit security operations command said. Iraqi government forces and powerful Iranian-backed Shi’ite militias face Islamic State on several fronts in Iraq, a major oil producer and OPEC member. They include areas around Baiji refinery, north of Baghdad, and the city of Ramadi west of the capital, seized last month by Islamic State, the ultra-hardline Sunni group that poses the biggest threat to Iraq since the fall of Saddam Hussein in 2003. […]