Donald Trump has described himself as the "president of law and order" as he threatened to deploy the military if state governors did not halt ongoing violent protests across the United States.
Speaking in the White House Rose Garden, Mr Trump said: "First, we are ending the riots and lawlessness that has spread throughout our country. We will end it now.
"Today I have recommended to every governor to deploy the National Guard in sufficient numbers that we dominate the streets.
"If a city or state refuses to take the actions that are necessary to defend the life and property of their residents, then I will deploy the United States military and quickly solve the problem for them."
There have been six straight days of unrest set off by the death of unarmed black man George Floyd in Minneapolis, with curfews now imposed in New York City and Los Angeles due to a coast-to-coast outpouring of rage over police killings of black people.
A vehicle drove through a group of police and National Guard troops at a demonstration in support of George Floyd in upstate New York, injuring at least two officers.
Video from the scene shows the vehicle accelerating through an intersection in Buffalo, almost 400 miles north-west of Manhattan, shortly after several officers apparently tackle a person on the street and handcuff that person.
Other officers are then seen tending to the injured officers on the sidewalk, while the vehicle drives off past a military vehicle on Buffalo's east side.
The officers were taken to Erie County Medical Centre, where authorities said their condition was stable.
Meanwhile, police made unrelated arrests inside iconic department store Macy's in Manhattan as violence and protests continued in streets across America.
Earlier on Monday, a medical examiner classified Mr Floyd's death as a homicide, saying his heart stopped as police restrained him and suppressed his neck.
A Minneapolis police officer has been charged with third-degree murder in Mr Floyd's death, and three other officers have been fired
New York imposed an 11pm to 5am curfew on Monday as the nation's biggest city tried to head off another night of destruction, state governor Andrew Cuomo and city mayor Bill de Blasio said.
The limitation on 8.6 million people's movements - on top of restrictions already imposed because of coronavirus - came as the mayor and governor condemned the outbreaks of violence, but also criticised some police actions as fuelling protesters' rage.
Crowds gathered at Belfast City Hall on Monday afternoon hours before a demonstration took place outside the US Embassy in Dublin.
Protests have taken place across the world, including a large gathering in London on Sunday.
In Belfast a vigil took place at Writers’ Square on Sunday before a demonstration at City Hall on Monday during which protesters held aloft signs which read “Black Lives Matter” among others.
Hours later in Dublin the streets around the US Embassy were filled by protesters who chanted ‘No Justice, No Peace’, ‘Silence is Betrayal’ and ‘Black Lives Matter’ before kneeling for a minute’s silence and then singing Ireland’s Call.
On Monday, Mr Floyd's brother Terrence appeared at the junction in Minneapolis where his brother died to appeal for peace.
"I understand you're upset," he told the crowd through a megaphone. But he said civil unrest and destruction is "not going to bring my brother back at all. It may feel good for the moment, like when you drink, but when you are done, you're going to wonder what did you do. Let's do this another way".
Racial tensions around the US have also been running high because of the arrest of two white men in May in the February shooting death of black jogger Ahmaud Arbery in Georgia, and after police in Louisville shot Breonna Taylor dead in her home in March.
Even as police in some places tried to calm tensions by kneeling or marching in solidarity with protesters, officers elsewhere were accused of the very type of harsh treatment at the heart of the unrest.
The scale of the protests has rivalled the historic demonstrations of the civil rights and Vietnam War eras. At least 4,400 people have been arrested.
