A heated quarrel between a bus driver and a passenger was to blame for the tragic crash which killed more than a dozen in southwest China's Chongqing Municipality on October 28, local police said at a news briefing on Friday.
The wreck was pulled out of the river on Wednesday night by a floating crane.
The second video shows the moment the bus swerved on the bridge, getting out of its lane and into oncoming traffic.
The bus plunged 50 metres off the bridge into the Yangtze, China's longest river, in Chongqing city on Sunday.
He refused, and she went on to hit his head with her mobile phone, prompting the driver to strike her back.
13 people were confirmed killed in the incident, while two are still missing.
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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. He grabbed her arm when she attacked him again, then hastily steered to the left, sending the bus out of control.
According to the China Daily, a female passenger named Liu had missed her stop and asked the driver to stop immediately.
Buses in China often have surveillance cameras.
Search and rescue teams dispatched more than 70 boats, as well as a team of scuba divers and underwater robots, to find the wreckage and retrieve bodies from the water.
The driver then took his right arm off the steering wheel as he tried to defend himself.
The passenger and driver have been identified by their surname as 48-year-old Liu and 42-year-old Ran, both from Wanzhou, police added.