A powerful explosion has killed at least 16 people near the southern Afghan city of Kandahar, reports say. The blast destroyed a bridge and those killed were travelling on a bus, the Associated Press news agency reported. Deputy police chief Ustad Nazir Jan blamed the explosion on Taleban and al-Qaeda fighters or their allies, although no one has claimed responsibility. He said he believed Afghan soldiers from a nearby army unit were the target. Eyewitnesses said the blast on the Rambasi Bridge, about 10 kilometres (six miles) south of Kandahar, left the bus a twisted and mangled wreck. Only two people on board the vehicle are believed to have survived. The dead are said to include a child and an elderly man.