At least 21 people died and 25 were injured in a bus accident Tuesday in the northern Peruvian town of Sindron, the Health Department of La Libertad region said. Although the cause of the accident was not immediately known, preliminary reports said it involved a bus operated by the firm Kurrungo that was travelling to the city of Trujillo, dpa reported. Bus accidents are relatively common in Peru because of mechanical failures in old or poorly maintained vehicles, the negligence of overworked drivers or harsh terrain.