Police fired tear gas outside the White House late Sunday as anti-racism protestors again took to the streets to voice fury at police brutality, and major US cities were put under curfew to suppress rioting.
With the Trump administration branding instigators of six nights of rioting as domestic terrorists, there were more confrontations between protestors and police and fresh outbreaks of looting.
Violent clashes erupted repeatedly in a small park next to the White House, with authorities using tear gas, pepper spray and flash bang grenades to disperse crowds who lit several large fires and damaged property.
Local US leaders appealed to citizens to give constructive outlet to their rage over the death of an unarmed black man in Minneapolis, while night-time curfews were imposed in cities including Washington, Los Angeles and Houston.
One closely watched protest was outside the state capitol in Minneapolis' twin city of St. Paul, where several thousand people gathered before marching down a highway.
"We have black sons, black brothers, black friends, we don't want them to die. We are tired of this happening, this generation is not having it, we are tired of oppression," said Muna Abdi, a 31-year-old black woman who joined the protest.
Hundreds of police and National Guard troops were deployed ahead of the protest.
At one point, some of the protestors who had reached a bridge were forced to scramble for cover when a truck drove at speed after having apparently breached a barricade.
The driver was taken to hospital after the protestors hauled him from the vehicle, although there were no immediate reports of other casualties.
The New York Times said he was later arrested.
Minneapolis police later reported they had discovered caches of homemade firebombs around the two cities.
There were other large-scale protests Sunday night, including in New York and Miami.
Washington's mayor ordered a curfew from 11:00 pm until 6:00 am, as a report in the New York Times said that President Donald Trump had been rushed by Secret Service agents into an underground bunker at the White House on Friday night during an earlier protest.
The White House yesterday called for "law and order" and blamed agitators for a sixth straight night of violent protests, reports Reuters.
"We need law and order in this country," White House spokeswoman Kayleigh McEnany told Fox News. She said Antifa, an anti-fascist group, was "certainly behind" the violence.
In Louisville, Kentucky, CBS affiliate WLKY-TV reported the local police chief as saying law enforcement shot and killed a man yesterday morning as they broke up a crowd, although it was unclear if the group was taking part in protests.
Meanwhile, China said yesterday unrest in the United States highlighted its severe problems of racism and police violence, and exposed Washington's double standards in supporting Hong Kong's protesters.
"Black people's lives are also lives. Their human rights must also be guaranteed," foreign ministry spokesman Zhao Lijian told reporters in Beijing.
"Racism against ethnic minorities in the US is a chronic disease of American society," Zhao added.
Major music industry labels -- Atlantic Records, Capitol Music Group, Warner Records, Sony Music -- are pledging to halt business today, in solidarity with anti-racist demonstrators demanding structural social change and an end to police brutality.
ROLEX STORE RANSACKED
Looting was reported Sunday night in Philadelphia and the Los Angeles suburb of Santa Monica, and images on Fox TV showed ransacked Rolex and Gucci stores in New York city.
Officials in LA -- a city scarred by the 1992 riots over the police beating of Rodney King, an African-American man -- imposed a curfew from 4:00 pm Sunday until dawn.
"Please, use your discretion and go early, go home, stay home," the city's mayor Eric Garcetti said on CNN.
The shocking death last Monday of an unarmed black man, George Floyd, at the hands of police in Minneapolis ignited the nationwide wave of outrage over law enforcement's repeated use of lethal force against unarmed African Americans.
Floyd stopped breathing after Minneapolis police officer Derek Chauvin knelt on his neck for nearly nine minutes.
Chauvin has been charged with third-degree murder and was due to make his first appearance in court yesterday.
Late Sunday, as hundreds were being arrested for curfew violations in Minneapolis, authorities moved Chauvin to another location from the Hennepin County Jail for his own safety, according to Minnesota's corrections commissioner.
Three other officers with him at the arrest have been fired but for now face no charges.
Governor Tim Walz has mobilized all of Minnesota's National Guard troops -- the state guard's biggest mobilization ever -- to help restore order and extended a curfew for a third night Sunday.
The Department of Defense said that around 5,000 National Guard troops had been mobilized in 15 states as well as the capital Washington, with another 2,000 on standby.
'A NATION IN PAIN'
Joe Biden, Trump's likely Democratic opponent in November's presidential election, visited the scene of one anti-racism protest.
"We are a nation in pain right now, but we must not allow this pain to destroy us," Biden tweeted, posting a picture of him speaking with an African-American family at the site where protesters had gathered in Delaware late Saturday.
Floyd's death has triggered protests beyond the United States, with thousands in Montreal and London marching in solidarity on Sunday.
On the other side of the globe yesterday, thousands marched to the US consulate in Auckland chanting "no justice, no peace" and "black lives matter."
In Germany, England football international Jadon Sancho marked one of his three goals for Borussia Dortmund against Paderborn by lifting his jersey to reveal a T-shirt bearing the words "Justice for George Floyd."