The video shows the driver and the passenger attacking each other as the vehicle turns into the opposite lane, hits the guardrail and falls off a bridge over the Yangtze River and into the water.
Security footage from a bus which crashed into a river in China has revealed that the driver was fighting with a passenger moments earlier.
Police examined nearly 2,300 hours of surveillance videos along the bus route to determine the cause of the accident which gripped the nation.
According to Wanzhou police, the fight started after a female passenger missed her stop and asked the driver to pull over immediately.
All those onboard are presumed dead.
As the quarrel escalated, the statement said, the woman hit the driver on the head with her mobile phone.
The bus was retrieved from the river on Wednesday, and investigators were able to obtain the footage from the vehicle's surveillance system.
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As she continued to assault him, the driver swerved into oncoming traffic and hit a auto before breaking through the crash barrier and plunging into the Yangtze River, the longest river in Asia.
The 42-year-old driver, surnamed Ran, told her to get off at an earlier stop.
The bus was travelling at a speed of 51 kmph (31 mph) at the time of the accident, police said, adding that the investigation has ruled out any mechanical failure as a cause of the accident.
Thirteen bodies were reported to have been found.
In response, the driver takes a hand off the steering wheel and grapples with the woman for a couple of seconds.
The Wanzhou police statement said the behaviour of the driver and the passenger seriously endangered public safety and violated the law.