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.
Minnesota's governor said the tragedy of the death of George Floyd in police custody had morphed into "something much different - wanton destruction".
New York, Atlanta and other cities have seen violent unrest, while the White House was briefly locked down.
Minnesota remains the most volatile region, with curfews ordered for the Twin Cities of Minneapolis-Saint Paul from 20:00 to 06:00 on Friday and Saturday evening.
An ex-Minneapolis policeman has been charged with murder over the death.
On Friday evening, crowds gathered near the White House in Washington 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.
In Atlanta, a state of emergency was declared for some areas to protect people and property. Buildings were vandalised and a police vehicle was set alight as protesters gathered near the offices of news broadcaster CNN.
Mayor Keisha Lance Bottoms issued a passionate plea, saying: "This is not a protest. This is not in the spirit of Martin Luther King Jr. You are disgracing our city. You are disgracing the life of George Floyd."
In New York's Brooklyn district, protesters clashed with police, throwing projectiles, starting fires and destroying police vehicles. A number of officers were injured and many arrests made.
Mayor Bill de Blasio tweeted: "We don't ever want to see another night like this."
In Detroit, police are investigating after a 19-year-old man was killed when a vehicle pulled up to protesters and shots were fired into the crowd.
In Dallas, officers launched tear gas canisters after they were pelted with stones, with tear gas also fired in Phoenix.
Police in Portland, Oregon, declared a riot, with reports of looting and a number of fires.
Protesters blocked roads in Los Angeles and also in Oakland, where windows were smashed and "Kill Cops" graffiti sprayed.
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