A dispute and fistfight between a passenger and a bus driver was found to have caused the bus to plunge into Yangtze River in southwest China's Chongqing Municipality, local authorities said Friday.

A total of 13 bodies have been retrieved from the river in Wanzhou District and have all been identified. Two others remain missing.

A previous investigation found that 15 people including the driver were on the bus at the time of the accident on Sunday.