RIOT police had to evict more than 2,000 teenagers from an illegal Facebook rave at a £15MILLION mansion over fears the roof would collapse.

The revellers reportedly turned violent as they were cleared from the five-story property in posh Mayfair, west London early this morning.

See more pictures of rave chaos below:

 

Officers were bombarded with missiles as they tried to clear the derelict site on Park Lane amidst fears that it may collapse.

Violent ... partgoers had stand off with cops

Claytons/FocusPictures.co.uk

 

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Violent ... partgoers had stand off with cops

Claytons/FocusPictures.co.uk

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Oxford Street was entirely shut off while police dealt with the situation.

After a two hour standoff police managed to persuade the partygoers to leave the property.

Witnesses said people who had attended the rowdy bash had told them it was a squat party arranged on social networking website Facebook.

Account manager Andrew Bentham reportedly said: "There are thousands of teenagers on the street and it is getting violent, the riot police are trying to deal with them, but it is looking pretty volatile.

"I asked some of them what was happening and they told me it was a Facebook party gone wrong, apparently the roof of the building they were in was in danger of collapsing, so they have come spilling out onto the street."

Flashing ... partygoers flooded the streets outside the mansion

Jayne Russell/NI Syndication

A Scotland Yard spokesman said: "There was a bit of happening in a derelict building in Park Lane.

"We were called at about 11pm to reports of upwards of 2,000 people involved in what I suppose you would call an illegal rave.

"There were fears for their safety because of the state of the building. There were a few missiles being lobbed but we managed to use old fashioned loudhailers to clear the building.

"By about 1am they were all cleared out. There were no arrests and no reports of any injuries."