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Anti-austerity protesters staged a demonstration outside Downing Street after the Conservatives swept to a majority government in the general election.

Dozens of activists chanted "get the Tories out" as Whitehall was shut for several hours during the demonstration on Saturday afternoon.

Police said an estimated crowd of 100 people gathered outside Tory HQ before moving on to Downing Street.

One person, who described himself as a "warrior of the rainbow", tweeted a picture alongside the caption: "Anti-Tory Dem massive come down roving parly sq to Whitehall".

And Andrew O'Malley posted: "Whitehall closed. Large protest heading towards Downing St."

Joana Ramiro tweeted: "Absolute chaos in Whitehall as ppl evade police lines and kettles to get to #DowningStreet".

But another apparent activist was less impressed, posting: "Well, this #Whitehall protest is disappointing isn't it. Badly organised and shut down with protesters moved on in under 1hr."

A spokesman for the Met said: "Police in Westminster facilitated an unplanned anti-austerity protest outside Downing Street, SW1, today.

"No arrests have been made. Officers are working to minimise disruption to all road users and members of the public passing through the area."

It is unclear who the protest was organised by.

One planned march on Downing Street, which was set to be attended by thousands of campaigners, was said to have been cancelled after David Cameron's Conservatives swept to a majority in Thursday's election.

Whitehall closed. Large protest heading towards Downing St. pic.twitter.com/B5YLzrLtcW — Andrew O'Malley (@AndrewOMalley) May 9, 2015

The protest, organised by anti-austerity group The People's Assembly, had been planned to oust the Prime Minister amid claims the Tories were planning to "occupy Downing Street" even if they did not win a majority.

Its Facebook page attracted more than 16,000 planned attendees, and claimed that the Conservatives were "planning to declare that they are the legitimate government and have the right to form an administration".

But in the wake of Thursday's shock election result, the event was apparently cancelled as questions of the Conservatives' right to remain in power were dispelled when the party won a narrow Commons majority.

A post on the event's Facebook page said: "Following our poll on this event page we've agreed to cancel tomorrow and re-focus that energy to get the biggest possible national demonstration on Saturday 20 June.

"It was fantastic to see such overwhelming support for this action. It was right that we were prepared to mobilise against dirty tricks."

The post added: "It's been a difficult 24 hours. No one was expecting to wake up to a Tory majority today."