Police say at least five people have been killed in a gun battle with Taliban militants trying to expand their stronghold in the Swat valley. The clash took place overnight in Buner, a previously peaceful district to the southeast of Swat. According to Zakir Khan, a police official in Buner's Pir Baba area, a group of Taliban militants crossed into a mountainous area of Buner late Monday. Khan said armed tribesmen and police confronted them, and three officers and two tribesmen were killed. He estimated that more than a dozen militants also died.