Protesters have clashed with police in cities across the US over the killing of an unarmed African-American man at the hands of officers in Minneapolis.
Hundreds of people rallied outside the White House, which was briefly put under lockdown on Friday, demanding justice over the death of George Floyd.
Demonstrations have been taking place in Minnesota, New York and California.
A former Minneapolis police officer has been arrested and charged with murder over Mr Floyd’s death in custody.
Derek Chauvin, who is white, was shown in footage kneeling on 46-year-old Mr Floyd’s neck on Monday. He and three other officers have since been sacked.
Mr Chauvin, 44, is due to appear in court in Minneapolis for the first time on Monday.
President Donald Trump has described the incident as “a terrible, terrible thing” and said he had spoken with Mr Floyd’s family, whom he described as “terrific people”.
What happened during the protests?
On Friday evening, crowds gathered near the White House in Washington, DC, waving photographs of Mr Floyd and chanting “I can’t breathe” – invoking his last words and those of Eric Garner, a black man who died after being held in a police chokehold in New York in 2014.
The White House was then temporarily placed on lockdown, with the US Secret Service closing entrances and exits.
Curfews were ordered for the Twin Cities of Minneapolis-Saint Paul, from 20:00 to 06:00 on both Friday and Saturday evening. But further gatherings of protesters were reported after the curfew had come into effect, and buildings and vehicles were later set alight.
There were violent clashes between protesters with police in several cities, including New York, Los Angeles, Chicago, Denver, Houston, Louisville, Phoenix, Columbus and Memphis.
In Atlanta, buildings were vandalised and a police vehicle was set alight as protesters gathered near the offices of news broadcaster.
In Dallas, officers launched tear gas canisters after they were pelted with stones.
While Mr Chauvin has been charged with third-degree murder and second-degree manslaughter over his role in Mr Floyd’s death, the protesters want the other officers involved to face justice.
The case has reignited US anger over police killings of black Americans, and the nationwide protests follow days of looting and arson in Minneapolis.