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Protesters lit fires, threw rocks and smashed windows at county government offices in the US city of Portland on Tuesday, police and media said, after weeks of mostly peaceful anti-racism demonstrations.

The protesters lit fires in dumpsters and flames were seen inside the building, media said, prompting police to declare a riot. TV footage https://bit.ly/34c7Z5L showed people throwing stones at the building and debris on the street in flames.

Some protesters marched on the Portland Police Association building.

Black Lives Matter protests have been held across the United States in recent months after the May 25 death of George Floyd, a 46-year-old African-American man, who died after a white police officer knelt on his neck for nearly nine minutes.

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Protests, including in Portland, have at times erupted into arson and violence, and federal officers sent into the Northwestern city have repeatedly clashed with crowds targeting the federal courthouse there.

Police said some officers were targeted a night earlier with a "powerful green laser" capable of causing permanent eye damage when some protesters marched on the Portland Police Association building.

A crowd of about 200 gathered in the city's Colonel Summers Park before marching through Southeast Portland streets.

"Portland Police 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 said on Twitter.

The Multnomah Building houses county government operations.

Police said that failure to comply with its order to disperse could lead to arrests and use of tear gas, crowd control munitions and impact weapons.

Multnomah County Chair Deborah Kafoury released a statement at midnight, saying a small group of protesters had set fire to the "Office of Community Involvement".

"This is the heart of our county, where people in our community come to get married, get their passports, and celebrate their cultural traditions and diversity,” the Oregonian website quoted her as saying, adding the space is dedicated to community members "marginalized by the traditional political process.”

Media reported that fire in the building was put out by the police.

There were no immediate reports of any injuries or deaths, but the Oregonian reported that there were two arrests.

A crowd of about 200 gathered in the city's Colonel Summers Park late on Tuesday before marching through Southeast Portland streets, eventually arriving at the Multnomah Building, the Oregonian reported.

Reuters