- Thousands of people joined anti-racism protests across the US on Sunday.
- Trump has blamed the extreme left for the violence, saying he planned to designate a group known as Antifa as a terrorist organisation.
- Governor Tim Walz has mobilised all of Minnesota's National Guard troops - the state guard's biggest mobilisation ever - to help restore order.
Anti-racism protesters again took to the streets in cities across the United States Sunday to voice their fury at police brutality as the Trump administration branded the instigators of five nights of rioting domestic terrorists.
While local leaders appealed to citizens to give constructive outlet to their rage over the death of an unarmed black man, night-time curfews were again imposed in cities such as Los Angeles, Houston and Minneapolis, which has been the epicentre of unrest.
Thousands of National Guards troops have been deployed across the country in a bid to restore calm but protesters and police were involved in stand-offs in several cities while there were also fresh reports of looting.
The most 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.
"I want to make sure he stays alive," she added in reference to her son aged three.
Hundreds of police and National Guard troops were deployed ahead of the protest although there were no immediate reports of unrest.
There were other large-scale protests in cities such as Miami and Washington DC where riot police lined up outside the White House as the crowds gathered at a nearby park.
While there was no immediate repeat of the large-scale violence that has rocked cities in recent days, looters ransacked stores in a neighbourhood of Philadelphia.
And in the Los Angeles suburb of Santa Monica, looting was reported at stores in a popular beachside shopping centre with people running out of stores that had been broken into.
Officials in LA - a city scarred by riots over the police killing of Rodney King nearly three decades ago - imposed a curfew from 16:00 Sunday until dawn.
The shocking videotaped death 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; three other officers with him have been fired but for now face no charges.
Governor Tim Walz has mobilised all of Minnesota's National Guard troops - the state guard's biggest mobilisation ever - to help restore order.
Police fired tear gas and stun grenades to clear streets of curfew violators Saturday night in Minneapolis.
Walz extended a curfew for a third night Sunday and praised police and guardsmen for holding down violence, saying, "They did so in a professional manner. They did so without a single loss of life and minimal property damage."
"Congratulations to our National Guard for the great job they did immediately upon arriving in Minneapolis, Minnesota, last night," President Donald Trump said in a tweet adding that they "should be used in other States before it is too late!"
The Department of Defense said that around 5,000 National Guard troops had been mobilised in 15 states as well as the capital Washington, with another 2,000 on standby.
The widespread resort to uniformed National Guards units is rare, and it evoked disturbing memories of the rioting in US cities in 1967 and 1968 in a turbulent time of protest over racial and economic disparities.
Trump blamed the extreme left for the violence, saying he planned to designate a group known as Antifa as a terrorist organisation.
The United States of America will be designating ANTIFA as a Terrorist Organization.— Donald J. Trump (@realDonaldTrump) May 31, 2020
"The violence instigated and carried out by Antifa and other similar groups in connection with the rioting is domestic terrorism and will be treated accordingly," added Attorney General Bill Barr.
But Atlanta Mayor Keisha Lance Bottoms said that Trump, who has often urged police to use tough tactics, was not helping matters.
"We are beyond a tipping point in this country, and his rhetoric only enflames that," she said on CBS. "And he should just sometimes stop talking."
Democratic presidential candidate Joe Biden visited the scene of an anti-racism protest in the state of Delaware on Sunday.
"We are a nation in pain right now, but we must not allow this pain to destroy us," Biden wrote on Twitter, posting a picture of him speaking with a black family at the cordoned-off site where a protesters had gathered on Saturday night.
"As President, I will help lead this conversation - and more importantly, I will listen."
Police in Houston, Texas, made more than 130 arrests overnight. The Denver mayor said people had been stopped while bringing "assault weapons, handguns (and) baseball bats" into the city.
In New York, Mayor Bill de Blasio said a video showing a police car forcing its way through protesters in Brooklyn was "upsetting" but that he did not blame the officers, who faced "an extremely dangerous situation."
But unlike other mayors, de Blasio declined to declare a curfew and said he opposed bringing in "outside military forces" to help local police.
The death of Floyd has triggered protests beyond the US, with hundreds rallying outside the US embassy in London on Sunday in solidarity.
"I'm here because I'm tired, I'm fed up with it. "When does this stop?" Doreen Pierre told AFP at the London protest.
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".