Washington (CNN) Nearly 300 protesters were arrested at a US Senate building on Thursday afternoon as crowds of activists descended on Capitol Hill while lawmakers reviewed the FBI's report on the allegations against Supreme Court nominee Brett Kavanaugh.

Protesters gathered in the Hart Senate Building atrium after US Capitol Police barricaded the front of the Capitol.

In a statement, US Capitol Police communications director Eva Malecki said that at about 3:30 p.m., 293 people were arrested for unlawfully demonstrating.

Malecki added that around 5:20 p.m., police responded to reports of more demonstrations in the Dirksen Senate Office Building and arrested nine more people for crowding, obstructing or incommoding.

The Women's March, a liberal organization that originated as a grassroots movement in opposition of President Donald Trump, was one of multiple groups tweeting from the protest at the Capitol building.

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