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The Berkeley Police Department has requested the public’s help in identifying participants in a violent clash that erupted in the city’s downtown Saturday between anti-fascist groups and so-called alt-right groups, including white nationalists.

Trump supporters are pepper-sprayed during a clash with protesters at a “Patriots Day” free speech rally on April 15, 2017, in Berkeley. More than a dozen people were arrested after fistfights broke out at a park where supporters and opponents of President Trump had gathered. (Credit: Elijah Nouvelage/Getty Images)

Authorities have asked the public to submit videos and photos to the Police Department’s Dropbox account, so that they can identify lawbreakers.

“Police will be reviewing social media video footage to identify and arrest anyone involved in crimes on Saturday,” the Police Department said in a statement.

Saturday’s nonpermitted demonstration was billed as a “free speech” rally by conservative activists, but soon devolved into violence. In interviews and social media posts, some combatants said they were there to make trouble and that peaceful demonstrations over President Trump and other issues really wasn’t their goal.

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