An explosion at the headquarters of the 82nd Airborne Division west of Baghdad on Thursday, killed one soldier and wounded 14 others.
The bomb was concealed in a truck that was delivering furniture to the base, and three Iraqis in the vehicle died in the blast, a military spokeswoman said, according to The AP.
The incident took place in the Iraqi town of Ramadi, west of Baghdad.
"There was some kind of an event it may have been a suicide attack," a military spokesman told reporters.
Also Thursday, the US military reported one U.S. soldier drowned and another was missing after a patrol-boat accident on the Tigris River in Baghdad.
In addition, a senior reporter and a veteran photographer for Time magazine were wounded along with two U.S. soldiers when a grenade was tossed into their Humvee, the military and the magazine said Thursday.
Time senior correspondent Michael Weisskopf and contributing photographer James Nachtwey were traveling with a U.S. Army patrol in Baghdad on Wednesday night when the attack occurred, a statement from Time managing editor Jim Kelly said.
In Samarra, some 100 kilometers north of Baghdad, two members of the U.S.-led paramilitary Civil Defense Corps were killed overnight by unidentified gunmen while on patrol, witnesses said Thursday.
Elsewhere, two Iraqi civil defence force members were injured in separate attacks in the Baqubah region, 60 kilometres northeast of Baghdad, a security source and one of the victims said.
Mohammed Shannan, 35, suffered bullet wounds in the stomach and leg in a drive-by shooting at 8.00 am (0500 GMT) as he was leaving his house, Lieutenant Shaker Mahmud said Thursday, according to AFP. The incident occurred 20 kilometres west of Baqubah, he added.
In Baqubah itself, Uday Sobhi told AFP he was wounded in the foot when a grenade thrown by unknown assailants exploded.
