A bus driver has been killed in Brisbane after a passenger boarded the vehicle and "set him on fire", police allege.
The passenger allegedly doused him in a flammable liquid then set him alight. It did not appear to be terrorism-related.
Queensland Superintendent Jim Keogh told reporters: "There is no apparent motive. We're not alleging robbery - this is the senseless, needless taking of a life going about supporting the community by providing transport."
A 48-year-old man was taken into custody. Keogh said he was "compliant" with officers who aided the arrest.
Six "deeply traumatised" passengers have been taken to hospital to be assessed, mainly for minor injuries like smoke inhalation.
They were lucky to escape with their lives from the "substantial" fire. Some were already on the bus and others were at the bus stop where the arrested man had been waiting.
A taxi driver told the Courier Mail he busted down the back door of a bus to allow passengers to escape the inferno.
Brisbane's Yellow Cab company have confirmed the cab driver, Nyok, is a part of their fleet, and "are not surprised" by his heroic actions.
"I agree with the police that he's a hero," said Yellow Cab general manager Bill Parker.
"I'm not surprised because this is not unusual for drivers of our fleet to be out there in the community.
"Unfortunately someone has passed away and that's very sad."
It is understood the company was yet to speak to Nyok as he is still talking to police. "We like to believe we're part of the social structure of our community," Mr Parker told news.com.au.
He said he was "not surprised" by Nyok's quick thinking and said the company's specific cab driver first aid training was crucial to drivers' development.