Roadside bombs and battles with Taliban forces killed six police and left 13 Taliban fighters dead or wounded in separate incidents in southern Afghanistan, officials said Friday. A roadside bomb exploded in Kandahar's Panjwayi district on Friday, killing three police officers and wounding four in a police vehicle, said Panjwayi district police chief Bismullah Khan. In the nearby Spin Boldak district, a roadside bomb killed two policemen and wounded three others in a border police vehicle, Gen. Raziq Khan said. Khan said that in nearby Arghistan district, a police operation against Taliban fighters on Thursday killed or wounded nine of the militants. In Zabul province, a two-hour gun battle killed one policeman and four Taliban, said acting provincial police chief Hakim Khan.