The wreck was pulled out of the river on Wednesday night by a floating crane.
13 people were confirmed killed in the incident, while two are still missing.
CCTV from on-board the bus shows how a passenger appeared to lash out at the driver, who in turn retaliated, seconds before the bus crashed and plunged into the Yangtze River. She walked up to the driver's seat and scolded him.
In this image taken from Sunday, Oct. 28, 2018 surveillance video footage run by China's CCTV via AP Video, a passenger strikes a bus driver with an object moments before the bus plunged off a bridge into the Yangtze River in Wanzhou in southwestern China's Chongqing Municipality.
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"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".
Deadly road accidents are common in China, where traffic regulations are often flouted or go unenforced.
The female passenger started quarrelling with the driver after she missed her stop, according to Wanzhou district police.
The bus then lost control and veered onto the wrong side of the road and collided into an oncoming vehicle before breaking through fencing and flying off a bridge over the river. The driver turned his head back several times during the argument. After the driver, surnamed Ran, refused to halt the bus, Liu then became enraged and struck Ran with her cell phone before the driver lost control of the vehicle. The driver's right hand came off the steering wheel during the altercation, which led to the steering wheel turning sharply to the left, the report said.