The Iraqi army says at least 175 people have been killed and another 200 wounded in a series of suicide truck bombings near the northern city of Mosul.
The bombings took place Tuesday in areas that are home to members of the minority Yazidi religious sect.
Earlier, a suicide truck bomb north of Baghdad destroyed a bridge linking the Iraqi capital with Mosul. Iraqi police say the attack killed at least 10 people and wounded six others.
In other news, the U.S. military said five service personnel were killed when a transport helicopter crashed Tuesday near an airbase west of Baghdad. A statement said the (CH-47 Chinook) helicopter went down while conducting a routine test flight.
The U.S. military also announced the deaths of five other American troops in Iraq.
The U.S. military said coalition forces killed four Mahdi Army militiamen and detained eight people in an operation in Baghdad's Sadr City. It said the suspects were believed to be involved in attacks on coalition troops and moderate Iraqis.
The military also said 16 suspected terrorists were detained in operations targeting foreign terrorists and bombing networks in the Tigris River Valley.