Five Afghan civilians died when their van struck a roadside bomb in western Farah province, a police official said Wednesday. The private van was heading toward neighboring Ghor province on Tuesday when it hit the bomb, which also wounded eight others, said Raouf Ahmadi, a police spokesman for the western region. Homemade bombs planted on roads or near government buildings have become a major killer in Afghanistan as the Taliban and other militants increasingly use guerrilla tactics to battle Afghan and international forces. The bombs usually target the military, but civilians are also frequent victims.