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A runaway bus smashed into traffic when the driver left the the handbrake off while he went into a shop, witnesses claim.

Horrified onlookers say they saw the man chasing after the double decker as it began careering down a hill and through several junctions before crashing into other buses and a car.

Four people were injured, including three inside a blue Renault Clio and a driver of another bus, when the First vehicle collided into them on Renfield Street, Glasgow, just before 4pm.

Arran Watkins, who arrived at the scene just minutes after the collision told the Daily Record: “We were just around the corner when the crash happened but I spoke to folk who saw it happen.

(Image: Arran Watkins)

(Image: Daily Record) (Image: Daily Record)

“What they said is it seems the bus driver parked his bus up to go into the shop.

“It’s then veered down Renfrew Street where it’s hit a blue car and that blue car has been pushed into a civilian.

“The civilian has been taken to hospital in an ambulance. The bus kept going and hit the single bus so hard that it’s taken a big chunk out of it and is now basically attached to it.

“The driver of the blue car is obviously injured and I saw some passengers getting off the two buses with folk on them saying they had sore necks so they might have whiplash and other minor injuries.”

(Image: Daily Record)

Another onlooker told the Evening Times: "It was terrifying, the bus was out of control. I hope the driver of the car is okay. He's in an ambulance."

The bus is believed to have been empty, although there were passengers on the other buses involved in the crash.

At least four buses are believed to have been involved in the crash as well as one car.

Several people on the scene told Glasgow Live that the bus driver had been seen chasing after the bus in an attempt to get back on board and stop the vehicle.

(Image: Daily Record)

A Police Scotland spokeswoman said: “Around 3.45pm, police received a report of a bus having struck a male pedestrian on Renfield Street near to West George Street, Glasgow.

"Emergency services are at the scene and enquiries are ongoing to establish the full circumstances of the incident.”

Officers have confirmed that none of the injuries sustained are life-threatening.