In Iraq, at least four police officers were killed on Wednesday when two suicide bombers, wearing explosives-packed vests, attacked a police battalion in western Mosul.According to National Iraqi news agency, a third suicide bomber who tried to enter the building was shot dead by police. The attackers detonated their vests in the room of Lt. Col. Shamel Ahmed Aughla, who headed the battalion. Police said Aughla was killed instantly while three other officers also died in the blast, along with the attackers. The officials said that part of the building collapsed in the explosions. Mosul is located in Iraq’s Nineveh province.