Police in Glasgow are investigating why a bin lorry crashed into a crowd of Christmas shoppers in the city centre killing six people.
The truck mounted the pavement outside the Gallery of Modern Art - hitting a group of people waiting to cross the road - carrying on for another 300 metres until it crashed into the Millennium Hotel.
The driver, who was said to be lucid when the vehicle finally stopped, was taken to hospital after the tragedy and it is believed he may have fallen ill at the wheel.
"We heard from eyewitnesses saying he wasn't looking around as the lorry was going across the pavement. He appeared to be slumped over the wheel," Sky's Gerard Tubb, reporting from Glasgow, said.
Seven other people are also being treated for their injuries in three hospitals in Glasgow.
Chief Inspector Mark Sutherland from Police Scotland said on Monday night: "We are currently working with our other agencies to establish exactly what happened.
"It's important that we do a thorough investigation to establish the full circumstances.
"It's important that we take all the necessary steps to do it as quickly as we can so that we get the answers for the families and get their loved ones back to them as quick as we can."
Police Scotland has appealed to anyone who has photos or videos of the incident to send it to them at georgesquareincident@scotland.pnn.police.uk.
Roads around George Square, which was packed at the time of the accident, remain closed.
A large cordon remains in place and dozens of floral tributes have been placed at the scene.
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Gallery: Images From The Devastating Scene In Glasgow After Bin Lorry Crash
The lorry crashed into the Millennium Hotel at the top of Queen Street in the city centre
One police officer said it first mounted the pavement 300 metres down the street
