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Protests against Donald Trump's "racist" campaign have erupted outside the US embassy in London just hours after the Republican candidate swept to victory in the US election.

Hundreds of demonstrators waving Black Lives Matters signs and pictures portraying the billionaire as Hitler could be heard chanting "refugees are welcome here" outside the Mayfair building.

Hitting out at the president-elect, one protester said: "Donald is the name of a duck in America. He's the only Donald we should know. This Donald is a quack."

(Image: AFP) (Image: AFP) (Image: REUTERS)

There were brief clashes between anti-racism campaigners and members of the far-right English Defence League who turned up to disrupt the demonstration.

One of the group's members told assembled media: "Donald Trump, he is the man, he’s telling it how it is. He’s not all about capitalism. He’s not all about stitching up Americans."

(Image: AFP) (Image: AFP)

Another far-right counter-protester then tried to rip a sign reading 'no to racism' and police were forced to step in to monitor the tense crowd.

Another added: "We want to oppose the little Donalds in Europe. The Le Pens, the Farages...just because you've won today, you haven't won forever."

Writing on Facebook, organisers Stand Up to Racism said: "The effects of a Trump presidency is set to be felt all over the world as racism and sexism is normalised through the voice of one of the most powerful and visible figures in the world.

(Image: Twitter/@bridiepjones)

(Image: Twitter/@bridiepjones)

"Join us tonight - Wednesday November 9 to send a powerful message that London stands against the dehumanising politics of Donald Trump."

It comes just hours after the embassy hosted an all-night Election Party for hundreds of diplomats and VIPs including London mayor Sadiq Khan and comedian Jimmy Carr.

(Image: Reuters)

The building was decked out in red, white and blue – with partygoers anxiously watching dozens of TV screens awaiting results from across the pond.

But the celebratory atmosphere quickly turned sour at about 4am when the vote began to swing in Mr Trump's favour.

The largely Clinton-supporting crowd who stuck it out until the bitter end looked increasingly despondent as the Republican candidate took swing state after swing state.

The party petered out as Mr Trump won Florida, then Ohio, then Wisconsin leading to his eventual victory.

(Image: Jason Kirkpatrick)

(Image: Jason Kirkpatrick)

There were similar protests outside the US embassy in Berlin where activists held signs saying 'make the world great again – choose love'.

Demonstrators also lit candles "in memory of freedom" just metres from the city's iconic Brandenburg Gate monument.