Two bus drivers were held up at gunpoint and robbed of their takings in separate incidents in Sheffield.
In the first attack a male driver who was at the wheel of a 120 First bus was robbed of cash just before midnight at a bus stop on Shortbrook Road, Westfield.
The male suspect was holding what is believed to have been an airgun, police said.
One passenger was on the bus at the time.
Three days later, at around 9.25pm, another male bus driver was robbed in similar circumstances.
The robbery also occurred at the bus stop on Shortbrook Road, Westfield.
The driver was again driving a 120 First bus, but there were no passengers on the vehicle at the time.
Brandon Jones, spokesman for bus company First, said: “Nominal amounts of money were taken on both occasions.
“Both of the drivers are fine but they were obviously shocked by what happened.
“There were no injuries or threats made to either driver or the passenger.”
Mr Jones said CCTV footage from the buses had been analysed and had assisted the police investigation.
He told The Star: “The CCTV across the Sheffield fleet is very useful and it should act as a deterrent to others.”
A South Yorkshire Police spokeswoman said that officers have arrested a 27-year-old man on suspicion of robbery.
He has since been released on bail pending further inquiries.
* Anyone with information about the incidents, which took place on Wednesday, December 18, and Saturday, December 21, is asked to call South Yorkshire Police on 101. Alternatively call Crimestoppers anonymously on 0800 555 111.