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Police and protesters clash in the U.S. over a violent weekend

The protests took a violent turn last weekend in several U.S. cities, with protesters raging against federal agents in Portland, Seattle and Oakland.

The turmoil stems from the weeks of protests over racial injustice and the police treatment of colored people that flared up after the death of George Floyd on May 25 in Minneapolis.

In Portland, thousands of people gathered Saturday night for another night of protests over the assassination of George Floyd and the presence of federal agents recently sent to the city by President Donald Trump.

Demonstrators broke through a fence around the city’s federal courthouse where the officers are stationed.

Police said the situation was a riot and at around 1.20 a.m. began ordering people to leave or risk arresting the area around the courthouse, saying on Twitter that the violence had created “a serious risk” for the public.

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A protester resigns to federal officers during a Black Lives Matter protest in Portland, Oregon (Marcio Jose Sanchez / AP)

About 20 minutes later, federal officers and local police attempted to purge the area and deploy tear gas, but the protesters continued – forming lines across intersections and holding improvised shields while police patrolled and blocked blocks that border the area.

Several arrests have been made, but it was not immediately clear how many.

In Seattle, police officers retired to a police station early on Sunday, hours after major demonstrations in the Capitol Hill neighborhood.

Some protesters lingered after officers arrived at the East Precinct Department at around 1am, but most disappeared a short time later, according to an online video.

During the weekend unrest, rocks, bottles, fireworks, and mortars were fired at the police, and police said they arrested at least 45 people for attacks on officers, obstruction, and not spreading.

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Federal officers launch tear gas at a group of protesters (Marcio Jose Sanchez / AP)

Twenty-one officers were injured, and most of their injuries were considered less serious, police said.

Meanwhile, protesters in Oakland, California set fire to a courthouse, damaged a police station, smashed windows, sprayed graffiti, fired fireworks, and aimed lasers at officers after a peaceful demonstration turned uproar on Saturday night, police said.

A protest against police brutality in Austin, Texas, became deadly when police said 28-year-old protester Garrett Foster was shot dead by a person driving through a crowd of protesters.

Austin police chief Brian Manley said a car hit the block where protesters stood and honked.

The driver and several witnesses told the police that Foster had approached the driver and had an assault rifle aimed at them.

In a video streamed live on Facebook, a car can be heard honking before several shots sound and protesters begin to scream and disperse to take cover.

It was then seen that the police cared for someone on the street.

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A demonstrator is holding a homemade riot shield (Christian Monterrosa / AP)

Mr Manley said that the driver called 911 and that he was later detained and released.

Police did not immediately identify the driver.

Sheila Foster, Garrett’s mom, said she was told that her son was pushing his fiancé, who uses a wheelchair, through a crossroads while the suspect was driving “capriciously” through the crowd.

She said the driver shot her three times.

In the suburb of Denver, Aurora, Colorado, a demonstrator shot someone injured after a car drove through a crowd marching on a freeway along the highway, police said.

The injured person was taken to a hospital in a stable condition.

Police have not released many details about the shooting, including whether the person who was shot had been in the car.