Police Brig. Gen. Hatim Khalaf and his driver were killed when a roadside bomb exploded 20 miles southwest of Kirkuk, police said. Khalaf was the chief of the operations center for the police in Kirkuk, headquarters of Iraq's northern oil-producing center. Two policemen were injured in a roadside bombing Sunday in Fallujah, the former insurgent headquarters 40 miles west of Baghdad. Fallujah has seen several deadly attacks in the past two weeks even though it became one of the most tightly controlled cities in Iraq after falling to a U.S. assault in November 2004.