A suicide car bomber detonated near a convoy of private security forces Saturday in southern Afghanistan, killing four Afghan guards and 11 civilians, including three women and two children, police said. The bomb went off west of Kandahar city and also wounded six other guards as well as 20 civilians who were in two minivans passing by the convoy, said Kandahar provincial police chief Syed Agha Saqib. Five women and three children were among the civilians wounded, the Associated Press reported.