A number of wounded people have been taken to hospital but others remain trapped inside a Glasgow pub after a police helicopter came down on its roof, officials said.
The police helicopter came down on the roof of the Clutha Vaults pub, on the banks of the Clyde, at 10.25pm yesterday evening. There were a number of customers in the Pub.
Police Scotland confirmed the helicopter involved was a Eurocopter EC135 T2 with three people on board - two police officers and a civilian pilot.
A major incident has been declared and First Minister Alex Salmond has warned that "we must all prepare ourselves for the likelihood of fatalities".
Assistant Chief Officer Lewis Ramsay, of the Scottish Fire and Rescue Service, said it was difficult to tell how many people were trapped inside. "It's a case of working hard within the building to try and determine how many casualties are there," he told reporters.
Police have set up a telephone number for members of the public who are concerned about relatives who may have been involved in the crash. It is 0800 092 0410.
The Scottish Ambulance Service confirmed that multiple ambulance crews and the Special Operations Team were at the scene. One image of the crash showed the dark blue helicopter on the roof with yellow ''POLICE'' insignia on part of the wreckage.
Vic Emery, chairman of the Scottish Police Authority, said: "My thoughts, and those of all in the authority, are with the relatives of all those affected by this very serious incident.