500 guests escaped unharmed from Sheraton Grand London Park Lane after a plaster ceiling collapsed during a Jewish wedding at the weekend.
Emergency services confirmed they received no reports of any injuries.
Four fire engines and around 30 firefighters were called to the hotel at around 4.30pm on Sunday and remained on site until 7.45pm, according to the London Fire Brigade.
The incident, which is believed to have been caused by a water leak, took place in the Silver Gallery in the ground floor lobby, which has been closed.
A Met Police spokesperson said: “No one was trapped and there were no reported casualties. The Health and Safety Executive has been informed.”
A spokesperson for the hotel said: “The Silver Gallery remains closed while repair work takes place. We sincerely apologise for the inconvenience caused.”
“I turned around and the ceiling was caving in,” a witness, who asked not to be named, said.
“All these bricks and dust were coming down the stairs. There was a cloud of smoke, dust and rubble.
“The toastmaster got hit on the head and fell to the floor. People were falling over from panic”.
Another guest posted on the hotel’s Facebook page that people “could have been killed”.