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SHOCKING footage has shown Portland Black Lives Matter protesters set an office building on fire and throw rocks during a "riot."

The demonstrators marched to the Multnomah Building on Tuesday night as authorities declared the assembly .

The office was set alight
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The office was set alightCredit: Jarridhubtv via Storyful
People threw rocks at the building
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People threw rocks at the buildingCredit: Jarridhubtv via Storyful

The building, which houses county government operation, also had its doors smashed and fires were set alight outside of the building, according to officials.

When there was a hole in the windows, flaming materials appeared to be tossed into the building leading to the office setting alight.

"@PortlandPolice has declared the gathering near the Multnomah Building a riot after individuals vandalized, repeatedly smashed first floor windows with rocks and threw burning material into an office," the Multnomah County Sheriff's Office tweeted.

Cops then cleared the area and asked the crowds to disperse.

has seen  for nearly three months since the police killing of  in  in May.

While the protests have been mostly peaceful,  on several occasions, typically after dark.

The windows were shattered
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The windows were shatteredCredit: Jarridhubtv via Storyful
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