At least 15 people have reportedly been arrested
Riot police in Berkeley, California used tear gas and formed barricades to separate the two groups as protesters fought and threw objects at each other.
At least 20 people have been arrested, according to reports.
A Berkeley police statement read: “A large number of fights have occurred and numerous fireworks have been thrown in the crowds.
“There have also been numerous reports of pepper spray being used in the crowd."
Police said a knife and stun gun were among the items confiscated at the scene.
Photographs taken at the scene show both protesters and Trump supporters with injuries amid the chaos.
Photos showed people injured at the scene
Riot police used pepper spray and tear gas to contain the situation
Hundreds of the President’s supporters had gathered in Civic Centre Park for a “Patriots Day” rally earlier today.
But an equal-sized counter-demonstration clashed with the Trump supporters shortly after it had begun.
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Police said a knife and stun gun were confiscated at the scene
Fireworks, bottles and traffic cones were thrown between the two groups as police scrambled to separate them.
One man set a red “USA” hat ablaze and held it overhead in protest.
It is the second time this year violent clashes have broken out on Berkeley’s university campus.
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In February, even more protesters held a demonstration on campus in protest of an appearance by right-wing commentator Milo Yiannopoulos.
The university said more than £80,000 ($100,000) worth of damage was done during February’s protest.