Police in northern Iraq say a suicide car bomber attacked the offices of a Kurdish political party on Sunday, killing 45 people and injuring dozens.
Authorities in the town of Makhmur say the mayor was one of the injured in the attack on the offices of the Kurdistan Democratic Party.
In Baghdad, a car bomb killed 17 people and wounded about 40 at a market.
Meanwhile, the al-Qaida-led militant group the "Islamic State in Iraq" says it captured several US soldiers in a Saturday attack that killed four US soldiers and an Iraqi interpreter south of Baghdad. The claim, posted on an Internet site, has not been confirmed.
Four-thousand US troops are searching for three U.S. soldiers missing since the attack near Mahmudiya.
Military officials said the search will continue until the status of the missing soldiers is known. Two American soldiers who were captured after an ambush near Mahmudiya last year were found slaughtered days later.
Meanwhile, US Major General William Caldwell says three-thousand more US troops have been sent to Diyala province, which has become increasingly violent.