A fight between the bus driver and a passenger was to blame for the crash in Chongqing's Wanzhou District, police said on Friday.
13 people were confirmed killed in the incident, while two are still missing.
The second video shows the moment the bus swerved on the bridge, getting out of its lane and into oncoming traffic.
Police said the passenger, identified as a 48-year-old woman with the surname Liu, was angry that the bus had missed her stop. However, Liu did not get off and later asked the driver to stop the bus when she realised she missed her destination.
Authorities confirmed that at least 13 people have been killed after the bus veered onto the wrong side of the road and collided with an oncoming vehicle before smashing through roadside barriers and flying off a bridge in Chongqing's Wanzhou District last Sunday.
The bus collided with an oncoming vehicle before smashing through barriers and into the Yangtze River on Sunday. He grabbed her arm when she attacked him again, then hastily steered to the left, sending the bus out of control.
Police examined nearly 2,300 hours of surveillance videos along the bus route to determine the cause of the accident which gripped the nation.
For days after the accident, the No. 22 bus lay at the bottom of the Yangtze River - in waters more than 70 meters (230 feet) deep.
As the quarrel escalated the woman hit the driver on the head with her smartphone, the statement added.
Authorities ultimately blamed the 42-year-old bus driver for not following safety protocols but found that both the passenger and the driver had broken the law and endangered public safety.
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