A suicide car bomb killed two Afghan civilians and wounded 23 more in an attack outside a U.S. military base and the German embassy in the Afghan capital on Saturday, REUTERS quoted officials and witnesses as saying. A sewage tanker and several cars were burning at the scene and there were blood stains on the road as police loaded bodies and wounded onto the back of pick-up trucks and ambulances ferried wounded to nearby hospitals, a Reuters witness said. Two Afghan civilians were killed and 23 were wounded, an official at the Presidential Palace said. Fourteen of the wounded were taken to the nearby Emergency Hospital and one died on the way, hospital officials said. A middle-aged woman outside the hospital was beating her head and screaming that her son had died. She was almost hit by a car as she ran out into the road. Another man was crying and said his son had also been killed. Six U.S. troops were also wounded by the blast, a spokesman for U.S. forces in Afghanistan said. The bomber struck on a road lined with high concrete blast barriers that runs between the German embassy and Camp Eggers, the headquarters of a U.S. unit that trains the Afghan army and police. The presidential palace and United Nations headquarters in Afghanistan lie immediately behind Camp Eggers.