Four vanloads of police moved to break-up an iPod flash mob party at Victoria station in London last night.

An estimated 4,000 silent dancers had turned up for the spontaneous event, news of which is broadcast by emails and messages between friends.

The plan for these events is simple: attract as many people as possible to turn up with their iPods, and at a set time get everyone dancing to their different tunes across a public space.

The Victoria Station flash mob took place at 6.53pm, with 4,000 revellers taking part in a ten-second countdown before the scheduled time, when the concourse erupted into whoops and cheers, according to the Evening Standard.

The crowd then danced madly for two hours – until the police arrived to break-up the party.