Anti-Trump protesters clashed with police and were pepper-sprayed during a wild night in Washington DC on Thursday night.

A massive crowd of people who are against the president-elect gathered outside the National Press Club, which was holding the 'DeploraBall' - a celebratory event organized by Trump supporters from the 'alt-right'.

Hundreds of demonstrators were on the street outside the press club, many chanting and holding signs.

One pro-Trump person who was in the area, but did not attend the event, claimed the protesters were violent - accusing one of them of attacking him with a flagpole.

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Anti-Trump protesters are seen clashing with police and being pepper sprayed in Washington DC

21-year-old James Allsup (pictured) said he was attacked by a protester with a flagpole. He is pictured showing his alleged injuries

Donald Trump and Melania at the TrumpCandlelight dinner in Washington DC on Thursday

'I was wearing my "Make America Great Again" hat, and a white male came up behind me and swung at me with a flagpole - I kind of blacked out for a minute,' 21-year-old James Allsup told Fox News.

'Before I knew it my head was gushing blood - there’s blood on my Trump hat.'

Allsup posted a picture on his Facebook account showing him sitting on the ground with his hand held out in front of his face.

His hand appeared to have blood on it, but the alleged injury to his head could not be seen.

A protester wearing a mask over part of his face is seen holding a burning sign on the street outside the press club in DC

Police officers react as demonstrators against president-elect Donald Trump knock a police motorcycle on its side outside the National Press Club building

The 21-year-old, who posts a number of pro-Trump and 'anti-leftie' memes and other items on his Facebook page, wrote a caption with the image that read: 'Remember that this is what happens when you disagree with the "tolerant left".'

Protesters denied claims of any violence.

Videos shot by people in the protest showed the anti-Trump crowd confronted and was confronted by pro-Donald fans.

Police were surprised by a pop-up protest as demonstrators attempted to descend on the Trump International Hotel on Thursday evening.

A woman throws her fur coat over her head outside the National Press Club where protesters shouted at Trump fans

Police prevent party-goers from entering the National Press Building due to a street protest ahead of the presidential inauguration

About 200 protesters shouting ‘Let Us Through’ and ‘The Whole World is Watching,’ marched behind a banner calling the new administration ‘illegitimate’ and ‘Fascist’ tussled with cops as they made their way down 11th Street towards Trump’s signature hotel.

They waved placards calling for the incoming administration to be stopped ‘before it starts,’ and calling for DC to be brought to a halt.

Cops on bicycles were the first to arrive and soon found their transport strewn across the street by the protesters.

One officer threw his own bike out of the way so he could join a human barricade to stop the protesters getting close to the hotel.

Most of the Trump family was away from the hotel at the time as they were just leaving the Make America Great Again Welcome Celebration concert at the Lincoln Memorial. But his 10-year-old son Barron was believed to be inside.

Barron, Trump’s only child with incoming First Lady Melania, had missed most of the Inauguration celebrations.

The protesters knocked down barricades outside the hotel but dispersed peacefully after chanting ‘No KKK. No Fascist USA’ for a few minutes

Riot squad police manned the area, and about 9pm they hit the sea of people with 'chemical spray' as those who were leaving the event were having trash thrown at them, according to the Washington Post.

Anti-Trump protesters gather outside of the DeploraBall at the National Press Club building

DailyMail.com was able to get inside the ball, where a host of high-profile Trump backers spoke to the crowd.

Sheriff David Clarke addressed the 'deplorables' in attendance, most of whom went wild when he took to the stage.

The crowd reprised the 'Lock Her Up' chant throughout the night, and a bizarre painting of a very buff Donald Trump wearing a 'POTUS 45' t-shirt was on stage at one point.

Also spotted inside were Fox News host and Trump ally Sean Hannity, Geraldo Rivera, and 'pharma bro' Martin Shkreli.

Protesters cover their faces after being pepper sprayed outside the National Press Club

A anti-Trump protester is seen shouting into a megaphone near police officers during the demonstration on Thursday night

A massive crowd of those against the president-elect had gathered outside the National Press Club, which was holding the 'DeploraBall'

A female protester is seen surrounded by police during an anti-Donald Trump process in DC

One of the protesters told CNN Thursday's events are a sign of what is to come over the next four years.

'This is to build up momentum and mobilize people so that whatever s*** is coming down the pipe with Trump and Pence - their regime - we need to be ready,' 26-year-old Sarko Sarkodie said.

'The alt-right's vision for this country is not the one that we need. I'm out here tonight because I want to be part of the resistance efforts happening this week, and the resistance that'll be happening the next four years.'

Earlier, slogans had been projected onto a wall, including ones that read, 'Impeach the Predatory President,' and 'Bragging about Grabbing a Woman’s Genitals.'

Inside the National Press Club building, Sheriff David Clarke addressed the 'deplorables' in attendance, most of whom went wild when he took to the stage

There was also an odd painting of a muscular Donald Trump wearing a t-shirt that read 'POTUS 45' on the stage

'Pharma bro' Martin Shkreli was seen among protesters at the event on Thursday night in DC

There was also a massive white elephant with the word 'racism' on it outside.

Other protesters were seen in pictures and footage on social media setting small items on fire - including signs and Trump hats.

A Metropolitan Police Department spokesman said there had been no arrests.

It is expected that there will be protests across the next two days in Washington DC, as Trump is sworn in as president.

Protesters are seen holding signs outside the press club building in DC on Thursday night

A man with most of his face covered is pictured during a large demonstration against Donald Trump in Washington

A woman is seen trying to protect her face during the protest after police pepper-sprayed the area