BAGHDAD - The U.S. military said 14 American troops have died in several attacks in the past 48 hours, including five slain Thursday in a single roadside bombing that also killed four Iraqis in Baghdad.

Elsewhere, a suicide truck bomber struck the Sulaiman Bek city hall in a predominantly Sunni area of northern Iraq, killing at least 16 people and wounding 67, an Iraqi commander said.

The latest U.S. deaths raised to at least 3,545 the number of American troops who have died since the war began in 2003, according to an Associated Press count.

The deadliest attack was a roadside bomb that struck a convoy in northeastern Baghdad today, killing five U.S. soldiers, three Iraqi civilians and one Iraqi interpreter, the military said.

A rocket-propelled grenade struck a vehicle in northern Baghdad about 12:30 p.m. today, killing one soldier and wounding three others, another statement said.

Four other U.S. soldiers were killed and one was wounded Wednesday when their convoy was struck by a roadside bomb in a western neighborhood in the capital, the military said separately.

Southwest of Baghdad, two U.S. soldiers were killed and four were wounded Wednesday when explosions struck near their vehicle, according to a statement earlier in the day.

Two Marines also were killed Wednesday while conducting combat operations in Anbar province, west of Baghdad, the military said.

The explosion in Sulaiman Bek occurred about 10:30 a.m., and killed 16 people, an Iraqi army commander said.

Maj. Gen. Anwar Hama Amin, the commander of the Iraqi army's 2nd Brigade, blamed the blast on al-Qaida, saying it was the latest in a series of strikes by the terror network against government officials, whom they accuse of collaborating with the U.S. and the Iraqi government.

Amin said the target apparently was the mayor, who has lost five relatives in previous assassination attempts. The blast heavily damaged the city hall, along with several nearby houses and stores.