At least four Scotland Yard officers in riot gear were hurt after they were attacked by crowds with bottles, chairs and a suspected petrol bomb at an illegal Halloween rave party here last night.
The Metropolitan Police said officers were attacked when they arrived to close down the illegal party advertised on Facebook as "Scumoween: A Nightmare on Scum Street" at an address in Lambeth in central London late last night.
Four officers were treated for injuries at the scene and a number of arrests have been made.
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"There are no further reports of officers injured at this time. There is one report of a member of the public, a man, being treated by London Ambulance Service.
"As well as attacking police, the group also caused criminal damage to private vehicles and property in the area," it added.
Of the 13,000 invited guests on the social networking site Facebook, about 4,000 said they planned to attend.
Crowds first gathered at Albert Embankment, across the Thames river from Westminster, before dispersing down Lambeth Road on to Lambeth High Street and nearby Whitgift Street.
They reportedly charged at police, set fire to bins and chanted "scum" and "pigs".
On Wednesday, organisers had advised: "Stay peaceful, stay calm. Patience and numbers is in our favour. Do not antagonise the police. We don't need to.
"At the end of the day we want to leave them remembering our good attitudes, we just came to dance, we are not their enemy.