A car ran over a roadside bomb laid by the Taliban in the southern Afghan province of Helmand, causing an explosion which killed 11 civilians, a local official told a foreign news agency. The incident took place in the restive province's Nawzad district, Daud Ahmadi, a spokesman for the provincial governor, said. Thousands of US, NATO and Afghan troops have been battling a major offensive against the Taliban in Helmand's Marjah and Nad Ali areas since Feberuary 13.