Two suicide bombers have attacked a police battalion in the northern Iraqi city of Mosul and killed the commander. Police sources said two attackers, wearing explosive vests, detonated themselves in the room of Lieutenant Colonel Shamil Ahmed, who headed the battalion in Mosul's western area of Bab Sinjar. A third suicide bomber was killed by police before he was able to enter the main building. Lieutenant Colonel Shamil was known to be active in pursuing Al Qaeda members in Mosul. There is no immediate word on other casualties. Lieutenant Colonel Shamil had escaped an attempt on his life last year.