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Washington, Jun 1: Police fired tear gas outside the White House late Sunday as major US cities were put under curfew to suppress rioting as anti-racism protestors again took to the streets to voice fury at police brutality.

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.

"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.

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 later taken to hospital after the protestors hauled him from the vehicle, although there were no immediate reports of other casualties.

There were other large-scale protests in cities including 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.

Stores ransacked

Large-scale violence has rocked many US cities in recent days, and looters ransacked stores in a neighborhood of Philadelphia on Sunday.

In the Los Angeles suburb of Santa Monica, looting was reported at stores in a popular beachside shopping center.

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 and help us make sure that those who want to change this conversation from being about racial justice to be about burning things and looting things, don't win the day," the city's mayor Eric Garcetti said on CNN.

The shocking videotaped 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 is due to make his first appearance in court on Monday. Three other officers with him 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.

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. "They did so in a professional manner. They did so without a single loss of life and minimal property damage," he said.

"Congratulations to our National Guard for the great job they did immediately upon arriving in Minneapolis, Minnesota, last night," President Donald Trump tweeted, 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 mobilized 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 organization.

"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.

'A nation in pain'

Atlanta Mayor Keisha Lance Bottoms said 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.

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 hundreds rallying outside the US embassy in London 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 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".

Feb 22: Prime Minister Narendra Modi is unlikely to accompany US President Donald Trump and his family members during their visit to the Taj Mahal in Agra on Monday, official sources said.

The US President will arrive in Ahmedabad at around noon on February 24 for a less that 36-hour visit to India. He will be accompanied by a high-level delegation including First Lady Melania Trump, the President's daughter Ivanka Trump, son-in-law Jared Kushner and a galaxy of top US officials.

After attending an event at Ahmedabad, the Trumps will travel to Agra on Monday afternoon to visit the Taj Mahal before arriving at the national capital for the main leg of the visit.

When asked about reports that Modi may accompany Trump to Agra, official sources said there was no such plan.

They said the visit to the Taj Mahal in Agra by the US President and his family members will afford them the opportunity to view the historical monument suitably. Therefore, no official engagements or presence of senior dignitaries from the Indian side is envisaged there, the sources said.

Jan 22: Microsoft Corp’s chief executive officer said he worries that mistrust between the US and China will increase technology costs and hurt economic growth at a critical time.

Using the $470 billion semiconductor industry as an example of a sector that is already globally interconnected, Satya Nadella said the two countries will have to find ways to work together, rather than creating different supply chains for each country.

“All you are doing is increasing transaction costs for everybody if you completely separate,” Nadella said in an interview with Bloomberg News Editor-in-Chief John Micklethwait at Bloomberg’s The Year Ahead conference in Davos. That’s a concern as the executive said the world is on the cusp of a revolution around technology and artificial intelligence.

“If we take steps back in trust or increase transaction costs around technology, all we are doing is sacrificing global economic growth,” he said.

The agreement signed last week between the US and China was “not sufficient,” said Nadella, but represented “progress” on the issue of intellectual property protections for US technology companies working with China.

Nadella said he worries about the development of two separate internets, noting that to some degree they already exist “and they will get amplified in the future” with massive technology companies already in place in China.

The viewpoint clashes with Microsoft co-founder Bill Gates, who has been sceptical about the idea that ongoing US-China trade tensions could ever lead to a bifurcated system of two internets.

China and the US are the two leading AI superpowers, however the cooling political relations between them have slowed the international collaboration.

Nadella also warned that countries that fail to attract immigrants will lose out as the global tech industry continues to grow. The CEO has previously voiced concern about India’s Citizenship Amendment Act, calling it “sad.”

“However, Nadella said he remained hopeful.

“The fact that there is a 70-year history of nation-building, I think it’s a very strong foundation. I grew up in that country. I’m proud of that heritage. I’m influenced by that experience.”