Curfews have been ordered in cities across the US to try to stem unrest sparked by the death of a black man in police custody.
Largely peaceful protests later turned violent in many areas, with cars and buildings set alight and riot police using tear gas and rubber bullets.
President Donald Trump urged “healing” over the death of George Floyd but said he could not allow mobs to dominate.
An ex-policeman has been charged with murdering Mr Floyd, 46, in Minneapolis.
Derek Chauvin, 44 and white, is due to appear in court on Monday.
In video footage, Mr Chauvin can be seen kneeling on Mr Floyd’s neck for several minutes on Monday. Mr Floyd repeatedly says that he is unable to breathe.
07:25 GMT – Protests raise concerns over new waves of coronavirus
Protesters in Atlanta said they had to take to the streets to protest against police brutality despite the dangers associated with the coronavirus pandemic.
“It’s not OK that in the middle of a pandemic we have to be out here risking our lives,” Spence Ingram, a Black woman marching in Atlanta, told The Associated Press news agency.
It came as health experts and officials raised concerns over the virus’s spread during the protests that keep gripping major cities across the US.
“If you were out protesting last night, you probably need to go get a COVID test this week,” Atlanta Mayor Keisha Bottoms said, adding that “there is still a pandemic in America that’s killing Black and Brown people at higher numbers.”
06:57 GMT – Journalists hit by police in Minneapolis
Two members of a Reuters TV crew were shot with rubber bullets in Minneapolis shortly after a curfew as they were covering the protest.
“My security advisor and I were post with rubber bullets tonight. He had PRESS labeled clearly and visibly on his bulletproof vest,” one of the two reporters Julio-Cesar Chavez said in a tweet as he posted a photo of a previous moment when a police officer was aiming directly at him. Chavez explained in a second tweet that he was shot in the arm and the back of his neck with rubber bullets, while his security adviser was shot in the face, but saved by the gas mask he was wearing.