Updated - Dec. 3, 2:35 a.m. ET:
Nine people died in the crash, reports the BBC.
Three of them were in the helicopter, Sir Stephen House of the Scottish police told a press conference.
All nine victims have now been named — David Traill, the civilian pilot, 51; Kirsty Nelis, the police constable, 36; Robert Jenkins, 61; Mark O'Prey, 44; Colin Gibson, 33; John McGarrigle, 57; Tony Collins, 43; Samuel McGhee, 56; from Glasgow; and Gary Arthur, 48, from Paisley.
The helicopter crashed through the roof of the Clutha Vaults pub, Stockwell Street, Glasgow. The tail of the chopper is visible in this photo.
Helicopter Crash scene at pub..Not looking good for copter crew #crash #helicopter #Glasgow praying 4good outcome
JanHollands
@Janney_h
Helicopter Crash scene at pub..Not looking good for copter crew #crash #helicopter #Glasgow praying 4good outcome
Our thoughts are with the crew of @policescotland SP99 helicopter that has crashed in Glasgow - hoping everyone is alright.
Police Memorial
@Police_Memorial
Our thoughts are with the crew of @policescotland SP99 helicopter that has crashed in Glasgow - hoping everyone is alright.
Labour MP Jim Murphy was at the scene and reported multiple injuries.
Terrible here in Glasgow Helicopter crashed into roof of pub
Jim Murphy
@jimmurphymp
Terrible here in Glasgow
Helicopter crashed into roof of pub
Labour MP Jim Murphy can clearly be seen, centre of pic, helping survivor of Clutha pub helicopter crash
David Jack
@DJack_Journo
Labour MP Jim Murphy can clearly be seen, centre of pic, helping survivor of Clutha pub helicopter crash
It's a well established Glasgow pub. It's a horrible, horrible scene, but well done to the folk who were here. Everyone formed a chain of people from inside the pub to outside, and the fire brigade and everyone were here very quickly.
U.K. Prime Minister David Cameron offered his condolences on Twitter:
My thoughts are with everyone affected by the helicopter crash in Glasgow - and the emergency services working tonight.
David Cameron
@David_Cameron
My thoughts are with everyone affected by the helicopter crash in Glasgow - and the emergency services working tonight.
He would later thank the emergency services.
He also paid tribute to the bravery of the "ordinary Glaswegians who rushed to help."
As did the First Minister.
The emergency services are in full operation. Our thoughts are with everyone involved. Scottish resilience operation now mobilised. #clutha
FM Alex Salmond
@AlexSalmond
The emergency services are in full operation. Our thoughts are with everyone involved. Scottish resilience operation now mobilised. #clutha
This Vine video appears to show emergency services attending the scene.
Gordon Smart, editor of The Sun's Scottish edition, saw the crash. He told Sky News:
There was no fire ball and I did not hear an explosion. It fell like a stone. The engine seemed to be spluttering.
Firefighters worked through the night to free those trapped in the rubble.
125 firefighters continue rescue efforts at Glasgow pub hit by police helicopter. LIVE http://t.co/RZ8hwmS0D0 #Clutha
BBC Breaking News
@BBCBreaking
125 firefighters continue rescue efforts at Glasgow pub hit by police helicopter. LIVE http://t.co/RZ8hwmS0D0 #Clutha
This is an unimaginable horror and my deep condolences go out to those who have died or been injured [...] My thoughts are with them and also with the people of Glasgow. They've shown great bravery and great calm. I've been in contact with Jim Murphy - he showed great presence of mind to help out those who have been injured.
Our hearts go out to everyone who has been bereaved. They should know the thoughts and prayers of everyone across the city and in Scotland are with them.
Sections of the rotor blades were hoisted away from the roof on Sunday.
