Hundreds of Afghans clashed with police and soldiers Monday during demonstrations against the publication of cartoons of the Prophet Muhammad. Four people were killed and at least 19 wounded, officials said. The worst of the violence was outside Bagram, the main US base in Afghanistan, with Afghan police firing on some 2,000 protesters as they tried to break into the heavily guarded facility, said Kabir Ahmed, the local government chief. Two of the demonstrators were killed and five were injured, while eight police were also hurt, he said. No US troops were involved in the incident, Ahmed said.