Police looking for cyclist who attacked bus driver Seven Hills
The cyclist allegedly climbed on the bus at Seven Hills, in Sydney's northwest, and bashed the 64-year-old driver who had overtaken him in a dedicated bus transit lane on Friday morning.
He then got on his bike and rode away.
Mr Campbell said the cyclist was not allowed in the bus lane, known as a T-Way, and police had now been given access to CCTV of the incident.
"It's absolutely offensive and unacceptable for any physical violence in any circumstances," he told reporters in Sydney.
"There is no excuse for physical violence against a bus driver."
Police said the driver noticed the cyclist at about 5am (AEDT) and sounded his horn as he moved the bus around him.
At the next set of lights, the cyclist allegedly banged the bus window and broke the driver's window. Police allege that when the bus stopped again the cyclist boarded the vehicle and assaulted the driver.
Transport Workers' Union spokesman Darcy Waller said the driver had undertaken self-defence training and that should now be made available to all drivers.
"He was put into a position, though, where he was backed up against the wall of his bus," Mr Waller told Fairfax Radio Network on Monday.
"Luckily, there was a security screen on that particular bus which prevented the assailant getting right into it.
"He wasn't badly hurt, he's not one of the youngest drivers that are out there but ... he was able to defend himself."
Police are looking for the cyclist, who is described as being of white/European appearance and aged in his 30s. He is said to be about 178cm tall and was wearing a blue helmet and cycling clothes at the time of the incident.