Six Taliban militants have been killed as clash erupted in Afghanistan's Helmand province, 555 km south of Kabul, provincial police spokesman Farid Ahmad Farhang said Tuesday. "Taliban militants stormed police checkpoint in Kajaki district on Monday afternoon and police retaliated killing six rebels and injuring six others,"Farhang told Xinhua. Two police constables sustained injuries in the clash, he said. Taliban militants fighting the government have yet to make comment.