Three suicide car bombs, including one targeting a U.S. convoy, and several shootings killed at least six Iraqis in Baghdad on Wednesday, as a weeklong surge of violence by insurgents continued on the streets of the capital. South of the city, one Iraqi policeman was killed and two were seriously wounded when their patrol was hit by a roadside bomb in the town of Mowailha, said police Capt. Muthana AL-Furati. The bloodletting followed a day when insurgents killed at least 15 people in Iraq, including two U.S. soldiers hit by a suicide bomber in Baghdad, and a former aide to Saddam Hussein's half brother, Sabawi Ibrahim al-Hassan, who was gunned down in southern Iraq, officials said.