Qadir says the slain officer was traveling in a civilian car with his three guards when the explosive-laden car detonated around 2:00 p.m. on Thursday. The blast also wounded eight civilian bystanders.
Although violence has ebbed in Iraq since early 2008, insurgents are still capable of launching attacks against Iraqi security forces and government officials.
The Sunni-dominated town of Hawija, once an insurgent stronghold, is located about 150 miles (240 kilometers) north of Baghdad.
