Eight people have been killed in the helicopter crash at a crowded Glasgow pub, police said Saturday, with 14 others seriously injured in hospital.

Police Scotland Chief Constable Stephen House said the two officers and the civilian pilot aboard the police helicopter and five people inside The Clutha bar were all killed by the accident late Friday.

"We can now confirm that the number of fatalities involved in this incident has risen to eight," House told reporters at the scene.

"Three of these eight fatalities were found within the helicopter and were our colleagues in the helicopter crew. The remaining five people were found within the building.

"Fourteen people remain seriously injured in Glasgow hospitals and are being cared for by health colleagues there."

He said the rescue mission was complex and ongoing and would not be quick.

"We are dealing with a very sensitive investigation and operation here. It will go on for many days yet," he said.

"I'd also like again to commend the courage of the people in Glasgow who, heedless for their own safety, took action last night at the time of the incident and the many acts of kindness we've seen since."