This is the moment militant anti-fascist protesters attacked and 'milkshaked' a Conservative writer during a rally in Oregon.

The footage shows Andy Ngo, an editor at the online publication Quillette, being punched, kicked and covered in milkshake by members of the 'Antifa' movement.

Ngo, who describes himself in his Twitter bio as 'hated by Antifa', is seen attempting to get away from the crowd, some of whom follow him and throw milkshakes and other objects at his head.

Disturbing footage captured at the demonstration shows the moment Andy Ngo, an editor at Quillette, being punched, kicked and covered in milkshake

Ngo, who describes himself in his Twitter bio as 'hated by Antifa', is seen attempting to get away from the crowd

Andy Ngo shared more images from his attack

At least three demonstraters from Antifa, the collective term for a militant progressive protest movement, who oppose the far-right, were arrested.

The writer tweeted afterwards that he was bleeding and had been robbed of his camera equipment and was heading to the hospital for treatment.

He said: 'Attacked by antifa. Bleeding. They stole my camera equipment. No police until after. waiting for ambulance . If you have evidence Of attack please help.'

Adding: 'On way to hospital. Was beat on face and head multiple times in downtown in middle of street with fists and weapons. Suspects at large.'

At least three groups had planned rallies or demonstrations at different sites in the city, including members of the so-called Proud Boys and anti-fascist groups that include 'antifa,' and the fights occurred when participants of the opposing groups met, according to The Oregonian/OregonLive .

Sporting several welts and cults, Ngo was speaking into the camera when police arrived. Ngo asked the officers where they had been when he was being attacked

The writer tweeted afterwards that he was bleeding and had been robbed of his camera equipment and was heading to the hospital for treatment

Ngo shared a video to social media after the attack where he said his GoPro camera had been stolen and that he had been punched several times in his face.

Sporting several welts and cults, Ngo was speaking into the camera when police arrived.

He said: 'Where the hell were you? I was assaulted twice.'

The Oregonian reported multiple demonstrations were planned for Portland on Saturday, with one involving the right-wing group the Proud Boys and planned counter-protests involving a local Antifa group

Portland Police said afterwards they had advised people to clear the streets

Police also added afterwards that there had been some reports of milkshakes containing quick-drying cement

Portland Police said afterwards, as they advised people to clear the streets

The Oregonian reported multiple demonstrations were planned for Portland on Saturday, with one involving the right-wing group the Proud Boys and planned counter-protests involving a local Antifa group.

In a statement Saturday night, the Portland Police Bureau said: 'During today's events, there were multiple assaults reported, as well as projectiles thrown at demonstrators and officers.

'There were also reports of pepper spray and bear spray being used by people in the crowd. Officers deployed pepper spray during the incident.

'There were reports of individuals throwing 'milkshakes' with a substance mixed in that was similar to a quick drying cement. One subject was arrested for throwing a substance during the incident.'