Aug 21 (Reuters) – About 100 people blocked traffic, vandalized an immigration building, set fires to dumpsters, and threw rocks and glass bottles at police in the Oregon city of Portland on Thursday night, police said, adding they had arrested three people.

The gathering, declared unlawful by the police, followed successive nights of the police declaring a riot in parts of the northwestern city, including on Wednesday around the same Immigration and Customs Enforcement (ICE) building.

Police said they did not have to use tear gas or crowd control munitions on Thursday night.

10 PHOTOSPortland protestsSee GalleryPortland protestsPortland police officers walk through the Laurelhurst neighborhood after dispersing a protest of about 200 people from in front of the Multnomah County Sheriff’s Office early in the morning on Saturday, Aug. 8, 2020 in Portland, Ore. (AP Photo/Nathan Howard)Demonstrators gathered at Floyd Light City Park on Thursday, Aug. 6, 2020 in Portland, Ore.Protests turned violent again even after the mayor pleaded with demonstrators to stay off the streets. Police say an officer suffered what was described as a severe injury after being hit with a rock late Thursday. (Mark Graves /The Oregonian via AP)Black Lives Matter protesters march through Portland, Ore. after rallying at the Mark O. Hatfield United States Courthouse on Sunday, Aug. 2, 2020. Following an agreement between Democratic Gov. Kate Brown and the Trump administration to reduce federal officers in the city, nightly protests remained largely peaceful without major confrontations between demonstrators and officers. (AP Photo/Noah Berger)A Department of Homeland Security officer emerges from the Mark O. Hatfield United States Courthouse after demonstrators lit a fire on Sunday, Aug. 2, 2020, in Portland, Ore. Following an agreement between Democratic Gov. Kate Brown and the Trump administration to reduce federal officers in the city, nightly protests remained largely peaceful without major confrontations between protesters and officers. (AP Photo/Noah Berger)PORTLAND, OR – AUGUST 2: A protester who identified himself only as Soah flashes the peace sign while dancing in front of the Mark O. Hatfield U.S. Courthouse during a Black Lives Matter protest on August. 2, 2020 in Portland, Oregon. Portlands nightly protests have remained peaceful following Thursdays announcement that federal officers would begin a phased withdrawal from the city. (Photo by Nathan Howard/Getty Images)Portland Mayor Ted Wheeler speaks with Black Lives Matter protesters on Wednesday, July 22, 2020, in Portland, Ore. Late Wednesday Wheeler joined protesters at the front of the crowd and was hit with chemical irritants several times by federal officers dispersing demonstrators. (AP Photo/Noah Berger)Joseph Oakman and fellow Proud Boys plant a flag in Tom McCall Waterfront Park during an “End Domestic Terrorism” rally in Portland, Ore., on Saturday, Aug. 17, 2019.Portland Mayor Ted Wheeler said the situation was “potentially dangerous and volatile” but as of early afternoon most of the right-wing groups had left the area via a downtown bridge and police used officers on bikes and in riot gear to keep black clad, helmet and mask-wearing anti-fascist protesters — known as antifa — from following them.(AP Photo/Noah Berger)Members of dozens of civic leaders hold up signs spelling out Our City Our Home on Wednesday, Aug. 14, 2019, in Portland, Ore., during a rally to support the city in advance of protests planned for Saturday. The Mayor of Portland, Ted Wheeler, said anyone planning violence or espousing hatred at an upcoming weekend protest by right-wing groups in the liberal city “are not welcome here.” Wheeler spoke with other city leaders ahead of the event Saturday, which is also expected to bring out anti-fascist protesters. Anticipating trouble, none of the city’s nearly 1,000 police officers will have the day off Saturday. (AP Photo/Gillian Flaccus)Mayor Ted Wheeler speaks to people gathered in downtown Portland, Ore., Wednesday, July 22, 2020. Wheeler faced a hostile crowd of protesters, who screamed at and sharply questioned him as he tried to rally demonstrators who have clashed repeatedly with federal agents sent in by President Donald Trump to quell ongoing unrest in the city. (AP Photo/Gillian Flaccus)In this image made from video released by Karina Brown, Portland Mayor Ted Wheeler puts his hands to his mouth as he stands at a fence guarding a federal courthouse as tear gas drifts by early July 23, 2020, in Portland Oregon, during another night of protest against the presence of federal agents sent by President Donald Trump to quell unrest in the city. (Karina Brown via AP)Up Next

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Demonstrations against racism and police brutality swept the United States after the police killing in May of George Floyd, a 46-year-old Black man. In Portland, protests have erupted occasionally in arson and violence.

U.S. Attorney General William Barr was strongly criticized by Democratic politicians for sending federal officers to Portland to disperse protesters who had lit fires and broken windows at the city’s courthouse.

On Thursday, Portland police issued a timeline of protests, showcasing they had declared riots 17 times between May 29 and Aug. 19. (Reporting by Kanishka Singh in Bengaluru Editing by Frances Kerry)

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