A suicide bomber blew up a dynamite-laden truck in western Iraq on Saturday, destroying a key bridge on a highway used by the departing U.S. military, while four Iraqi soldiers were killed in a separate attack near Fallujah, police said, according to AP. There were no casualties in the Saturday morning blast that destroyed the bridge, said a police officer in the city of Ramadi, about 70 miles (125 kilometers) west of Baghdad. The highway is used heavily by the U.S. military to transport equipment out of the country. It is also a major roadway for local civilian traffic. Also Saturday, an attack on an Iraqi army convoy just outside of the city of Fallujah killed four Iraqi soldiers and wounded 14, said a police officer in the city, which is about 40 miles (65 kilometers) west of Baghdad. A U.S. military spokesman in Iraq's western Anbar province, where both Ramadi and Fallujah are located, confirmed the destruction of the highway bridge outside Ramadi.