Eighteen people have been treated, including six who were taken to hospital, after part of a ceiling fell down at a holiday camp in Somerset.
The collapse happened at Pontins Brean Sands, near Weston-super-Mare, at about 18:20 GMT, the fire service said.
It said structural ducting and ceiling sections collapsed in a bar area "exposing live damaged electrics".
A "number of people" suffered minor injuries but no-one was seriously hurt, Avon and Somerset Police said.
South Western Ambulance Service said 18 people had been treated.
Police said that a search of the scene had been carried out and confirmed that no-one was trapped under the debris.
The Health and Safety Executive has been informed of the incident.
Word is, and hopefully it's accurate, no one seriously hurt.— Iain O'Brien (@iainobrien) February 20, 2019
Serious amount of emergency services here.
Staff very shaken and look like they could do with a hug or two.
Laura Robinson, whose family of five children are at the site, said about 100 people were inside the building at the time of the collapse.
She said: "We were in the family clubhouse, suddenly part of the roof [came] down halfway across the room, all across tables and people.
"It has come straight down over the tables in a long line.
"I heard this cracking noise and looked up and part of it's coming down and then the whole way along it went."
One woman told the BBC: "If I wouldn't have moved a big slab of concrete would have landed on my head and split my head open.
"It landed right by my feet."
Former New Zealand cricketer Iain O'Brien said on Twitter: "Arrived back to Pontins Brean Sands this afternoon, after a day out, to a major site panic.
"Word is, and hopefully it's accurate, no-one seriously hurt.
"Serious amount of emergency services here. Staff very shaken and look like they could do with a hug or two.
Another man told the BBC: "My wife just ran out of the way of it.
"The seat where it went down on was the seat I was going to be because my coat was on the chair, so I had to pull my coat out."
Devon and Somerset Fire and Rescue Service said in a statement: "The incident involved the collapse of approximately 40m of structural ducting and ceiling sections, exposing live damaged electrics and making the scene unstable.
"Fire crews used eight high-pressure airbags and small tools to establish that no persons were trapped beneath the collapse."
The scene was made safe and fire crews had left the scene, they added.