A row between a bus driver and a passenger caused the vehicle to veer off a bridge and into the Yangtze River at Chongqing in southwest China on Sunday, killing 13 people, police officers said on Friday.
The former video shows the driver and a woman in the middle of a heavy verbal and physical altercation.
The bus had veered into the wrong lane and collided with an oncoming auto in Chongqing on Sunday before it plunged into the Yangtze River.
Authorities have released footage of the accident, as recovered from the bus' black box.
According to investigations, the 48-year-old female passenger had missed her stop and asked the driver to stop in the road.
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A huge rescue operation was mounted with teams of divers and dozens of boats and cranes deployed. China's state newspaper, People's Daily, reports 15 people died in the crash.
Police said the passenger was angry the driver had missed her stop. The driver turned his head back several times arguing. At one point, she took out her phone and started hitting him on the head with it. He then lost control of the bus.
The Chongqing police also posted dashcam video from a nearby auto showing the bus colliding with an oncoming vehicle before smashing through a guardrail and falling into the Yangtze, a major river in southwestern China.
The bus was retrieved from the river on Wednesday, and investigators were able to obtain the footage from the vehicle's surveillance system.
"The behaviour of both the passenger and driver has severely endangered the safety of all other passengers and has violated the law, ' police said, adding the tragedy served as an 'extremely painful lesson".