A night of fire and violence at the future site of a police training center in Atlanta on Sunday led to the arrests of 35 people, according to authorities.

Police said a group of “violent agitators” wearing all-black clothing attacked the construction area of the Atlanta Public Safety Training Center, which critics have dubbed “Cop City,” per the Associated Press.

People threw large rocks as well as molotov cocktails during the clash, said police, and some construction equipment caught fire.

Atlanta Police Chief Darin Schierbaum said during a Sunday night press conference that most of the people who were detained appear to be from out of state. They will face charges, he added.

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