Eight people have been injured, including one who is in a critical condition, after a doubledecker bus hit a railway bridge on the outskirts of Glasgow, police said.

Five people were being treated in hospital and three were assessed and released after the incident on Saturday in Cook Street.

A spokesperson for Police Scotland said: “Emergency services attended and five people were taken by ambulance to Queen Elizabeth university hospital for treatment.

“One person is described as being in a critical condition. Three others were assessed at the scene and attended at hospital.”

First Bus said one of its buses on the 4A route in Glasgow was “involved in a bridge strike incident” at about 6pm, “in which a doubledecker bus hit a railway bridge”.

A spokesperson for the company said: “We’re aware of numerous injuries, with one person being taken to hospital in an ambulance.

“We have launched an immediate investigation and are also assisting Police Scotland with their inquiries. Our thoughts are with everyone affected by this incident.”

It is not known which direction the bus was travelling, but the 4A route runs between Broomhill and Eaglesham.

Motorists were told to stay away from the area, with a number of roads remaining closed.

Spike Turner, a passenger who was sitting near the front of the bus, told the BBC the driver had taken a wrong turn and crashed “straight into the bridge”.

He added: “I was fine, the lady in front of me might have been concussed. The bridge itself wasn’t high enough to hit anyone’s heads but parts of the bus exterior have swung down.

“The man in the front seat was in a really, really bad state. He’s got a lot of blood and a massive gash on his head.”