Paul O’Connor was on board the x87 at around 9pm on Sunday, January 20.
He said: “As the bus was turning from Catherine Street into Townhead, a group of young people on bikes fired something at the bus and caused the window to break.
“I was sitting on the seat at the window when I heard a thug.
“I got off the seat and moved to the front to let the driver know about it.
“The bus then stopped right outside the Kirkie Puffer and the driver contacted his bosses to inform them of the attack. He was told to let all three of use passengers off the bus and to take it back to the depot”.
An angry Mr O’Connor added: “Parents of young children should be aware of where they are at nights.
“It’s just going to be a matter of time before someone is injured by glass and the bus company will be forced to withdraw part of the route at night”.
John Gorman, Head of Operations for First Glasgow said this afternoon (Tuesday): “First Glasgow condemns any acts of vandalism against our staff, passengers or our vehicles.
“Fortunately, no one was hurt in this and incidents of this nature are very rare on our buses, but I would like to commend our driver for his handling of this incident, followed procedure to ensure passenger safety was the number one priority and alerted the Police and depot when it was safe to do so. The incident is now a matter for the Police.”