Iraqi authorities say a roadside bomb has killed a police general and his driver near the northern city of Kirkuk.
The victim was Brigadier General Hatim Khalaf, head of the Kirkuk police operations room.
Also in northern Iraq, Kurdish officials say search teams have located a small plane that crashed three days ago near Sulaimaniyah. They say all six people on board, including at least three German businessmen, were killed.
The developments come a day after roadside bomb attacks in Baghdad killed an American soldier and three Iraqi policemen.
Separately, the U.S. military said Saturday it had freed more than 400 male Iraqi prisoners after an Iraqi-led review board recommended their release. Some information for this report was provided by AP and Reuters.