PORTLAND, Ore. (AP) Thousands of protesters gathered outside the federal courthouse in Portland, Oregon, into the early hours of Saturday shooting fireworks at the building as plumes of tear gas, dispensed by U.S. agents, lingered above.

The demonstration went on for hours until federal agents entered the crowd around 2:30 a.m. and marched in a line down the street, clearing remaining protesters with tear gas at close range. They also extinguished a large fire in the street outside the courthouse.

The Federal Protective Service had declared the gathering as an unlawful assembly and cited that officers had been injured.

As the crowd dispersed, someone was found stabbed nearby, Portland police said. The person was taken to a hospital and a suspect was taken into custody.

By 3 a.m., most demonstrators had left with with only some small groups roaming the streets.

Earlier Friday night, the protest had drawn various organized groups, including Healthcare Workers Protest, Teachers against Tyrants, Lawyers for Black Lives and the Wall of Moms. As the crowd grew authorities estimate there were 3,000 present at the peak of the protest people were heard chanting Black Lives Matter and Feds go home to the sound of drums.

Later, protesters vigorously shook the fence surrounding the courthouse, shot fireworks towards the building and threw glass bottles. Many times these actions were met by federal agents using tear gas and flash bangs.