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PORTLAND, Ore. -- Someone vandalized the Portland Police union headquarters doing thousands of dollars in damage early Tuesday.

Spokesman Scott Westerman said just before 1 a.m., bricks and rocks were thrown through their windows, doing about $20,000 worth of damage to the outside of the building.

Eight people were arrested and three officers were injured Monday night when protesters clashed with police in downtown Portland in a rally against two recent officer-involved shootings. DETAILS:Police protests

Westerman said computers and other items were damaged inside the office.

No suspects have been named in the case.

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