U.S. and Afghan troops fired warning shots after more than 1,000 protesters threw stones at a U.S. military convoy and at the main U.S. base in Afghanistan to demand the release of eight villagers detained in a raid. Afghan troops used batons to beat back the protesters as they tried to push down the base's outer gate, The Associated Press reported. It was not immediately clear if there were any casualties. Violence erupted after six U.S. military vehicles traveling in a convoy tried to enter the base. The protesters threw stones at the vehicles before troops inside the cars fired into the air. The vehicles then sped into the base and the demonstrators chased them, trying to push down a metal gate guarded by Afghan forces.