US Demonstrators smashed windows of Portland's Democrats, burned flags in Denver, and vandalized in Seattle, hours after Biden took office.

A group of protesters carrying anti-President Joe Biden and anti-police banners marched in Portland, Oregon, on January 20 sabotaging the Democratic headquarters in Oregon.

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Black Lives Matter protesters face police after Biden's inauguration in Portland, Oregon, on January 20 Photo: Reuters

"We don't want Biden, we want revenge," was one of several banners like "murder police" and "imperial warfare" that the protesters were carrying.

Group of people smashing windows, spraying paint symbols of anarchism at party headquarters.

The city police announced on Twitter that bicycle police went into the crowd, looking for someone carrying a weapon and seized banner sticks that could be used as weapons.

Another group of about 150 people gathered at 5:00 p.m. in Northeast Portland, listening to a speaker talking about police brutality.

"Today is an historic day," said one speaker.

The way the demonstration was a block of streets, a car was overturned, it is unclear who did.

Portland is a regular site of protests, many outbreaks into violent clashes between police and protesters, since the death of white police officer George Floyd, a colored man in Minneapolis in May.

In Denver, Colorado, about 100 leftist demonstrators and BLM supporters took to the streets and gathered near Colorado State Capitol Building to protest against the new president, while others carried anti-

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Portland Democratic headquarters window was smashed on January 20 Photo: AP

At least two people were arrested on charges of carrying weapons while burning American flags.

Protesters also marched and burned the US flag in Seattle, Washington state, on January 20.

Seattle police said they were watching the group as protesters marched through several streets.

Meanwhile in Sacramento, California, dozens of Antifa anti-fascists, some holding sticks and shields, parade across the street.

In a statement posted on the group's website in Sacramento, "replacing another scarecrow on January 20 doesn't matter to us. It has not worked against the elite white government that the US has built.

"Regardless of the damage that happened to Capitol Hill on Jan. 6, we recognize it as an outbreak of racist rage that has been building and organized throughout the years."

Most protesters were dressed in black, while others carried banners in support of the BLM movement.