A 55-year-old man allegedly assaulted a 53-year-old bus driver and robbed him Saturday in the Honolulu area, police said.

The driver of TheBus was on duty when the assault occurred at 12:20 p.m., police said.

Police arrested the suspect 20 minutes later.

He was taken into custody for investigation of second-degree robbery and interfering with the operator of a public transit vehicle.