Eight people were rescued after the mezzanine floor of a bar in East London collapsed.
Emergency services attended the incident at Two More Years in Hackney Wick on Saturday night, the Mirror reports.
A man who was in the bar at the time said the mezzanine floor 'came down in seconds'.
He added: "There was just this sort of cracking sort of noise and dust started coming down.
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"Me and my friend just ran to the side and the whole thing just came down in a matter of seconds."
He added it was lucky that there were not more people sitting directly under the mezzanine floor that came down.
The witness said he had seen one person being brought out on a stretcher and put into an ambulance, but most of the injured appeared to have cuts and bruises rather than anything serious.
London Fire Brigade said eight people were rescued by crews inside the wreckage, with some people rushed to hospital and others treated at the scene.
Another bar goer tweeted: "0/10 would not recommend being on the second floor of a bar when it collapses.
"I’m very much OK (as is everyone who was in the building from what I know), but that was terrifying."
Station Commander Sacha Clement, who is at the scene, said: "Firefighters have carried out a systematic search of the building and rescued eight people from inside.
"They were trapped on the remaining part of the mezzanine floor and crews used a ladder to bridge between the floor and the internal staircase to get them safely out of the building.
"We are working with our emergency services partners, and a number of people have been treated at the scene and taken to hospital."
A spokesman for Met Police added: “Police were called by the London Ambulance Service at 16:47hrs on Saturday, 12 February, to reports of a partial building collapse at a pub on Roach Road.
“Emergency services are in attendance.”
London Ambulance Service tweeted: “We were called at 4:44pm to Roach Road, Hackney Wick, to reports that part of a building had collapsed.
"We have sent a number of resources to the scene. Crews are treating patients at the scene and are working closely with emergency services colleagues."
A spokesman from London Fire Brigade confirmed a mezzanine floor in the bar had collapsed.
Fire crews are currently carrying out a search of the building.
Pictures from the scene showed people dangling among the wreckage as others work to clear the debris inside. Outside, others were draped with warming blankets as they surveyed the scene.
One witness said on Twitter: "Lots of people in shock but incredibly lucky more weren't badly hurt."
Another added: I hope no one is seriously injured or worse but the volume of sirens says otherwise."
Rushanara Ali, Labour MP for Bethnal Green and Bow, tweeted: "Very concerned about the collapse of part of a building at Roach Road #fishisland.
"My thoughts are with all those affected and their loved ones. Grateful to @Ldn-Ambulance and @TowerHamletsNow emergency response services for their support at this time."
A police cordon at the scene has been lifted.
