Small clashes broke out between anti-fascist groups and right-wing protesters during rallies that took over the streets of Portland, in the northwest of the United States, on Saturday.

Tensions boiled over as the far-right Proud Boys and Patriot Prayer were met by Antifa counterprotester.

Footage shows men punching and threatening each other, as well as protesters being arrested and one injured man on the floor.

According to reports, at least six people were injured, one having to go to hospital, and 13 were detained by the police.

The Proud Boys held a rally supporting the designation of the loose-collective Antifa as a terrorist group.

While the far-right group chanted "Four more years" in reference to US President Donald Trump's 2020 campaign, Antifa members clad in black marched through the streets chanting "No Trump."

Police reportedly seized a number of weapons from both sets of protesters.

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