Xinhua has reported that explosives were tossed from two vehicles after they collided into one another. The agency, citing witnesses, said two vehicles rammed into people at the open-air market shortly before 8 a.m., and then explosives were thrown from them. One of the vehicles exploded, Xinhua said. Photos from the news agency posted online showed flames bursting from what appeared to be a vehicle, and police and emergency workers carrying away injured people. Xinhua said the injured were taken to local hospitals, but gave no estimate of the numbers of casualties.The number of casualties is still unknown.