A security footage from a bus that plunged into a river in China on Sunday revealed a fist fight between the driver and a passenger ultimately led to the vehicle's doom.
Rescuers lifted the wreck of the bus from the river on Wednesday night.
A statement from Wanzhou district police said the 48-year-old female passenger asked the driver to pull over after she missed her stop, but he didn't.
Police examined nearly 2,300 hours of surveillance videos along the bus route to determine the cause of the accident which gripped the nation.
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 auto before smashing through roadside barriers and flying off a bridge in Chongqing's Wanzhou District last Sunday.
Fifteen people including the driver were thought to be on the bus at the time.More news: Oscar now Atlantic hurricane, no threat to land
According to the Ministry of Emergency Management, the salvage work was especially hard because of the small size of the bus, the depth of the water, limited visibility and shifting currents that impeded divers.
Rumours prompted calls to ban female drivers, as the vehicle that the bus hit was driven by a woman.
The Wanzhou police statement said the behaviour of the driver and the passenger seriously endangered public safety and violated the law.
They said she hit the driver, named Ran, with her mobile phone when he refused to stop and let her off.
In response, the driver takes a hand off the steering wheel and grapples with the woman for a couple of seconds. The bodies of 13 people were recovered; two remain missing.
During the ensuing fight, the driver lost control and the bus went into the river.