CNN’s Atlanta news centre has been under attack from protesters angry at the killing of a black man, George Floyd, while a lockdown at the White House has now been lifted.

The demonstration is one of several that has turned violent across the United States as protests spread over Floyd’s death. He was being arrested in Minneapolis earlier this week and died after being pinned by the neck under a white police officer’s knee.

CNN has reported that several police vehicles have had their windows broken in front of their building.

CNN reporter Nick Valencia said he has been hit by BB pellets aimed at the police and he and his film crew were forced to take cover after there was an explosion on the ground between the protesters and police.

“There are officers that we can report, at least two officers have been injured – one of them it appeared to be seriously injured. He was being dragged out,” Valencia told CNN viewers.

“You can see what’s left behind of this glass – the glass partition that separates the street. These demonstrators are now launching something. It appears to be some kind of smoke grenade that they’re throwing inside CNN Centre right now.”

At least one police car was among several vehicles burnt. Windows were smashed at the CNN building, along with store fronts. Police pushed back the crowd, but they hurled bottles at officers.

Earlier in the night in Atlanta, in an impassioned speech, Bernice King, the youngest daughter of civil rights icon Martin Luther King Jr., implored people to go home after more than 1,000 protesters marched to the state capitol from the Centennial Olympic Park, blocking traffic and an interstate highway along the way.

“The only way we get what we really want is through non-violence,” Bernice King said in her father’s hometown. “Let’s do this the non-violent way to deal with the evil of our time.”

King was assassinated in 1968, a year after race riots spread across many big cities.

In Washington, the White House was temporarily sent into lockdown as protests over the death of Floyd escalated.

Hundreds of people gathered in Lafayette Park near the White House after marching through the capital.

Protesters shouted “No justice, no peace,” and “I can’t breathe” as the march unfolded.

The march took place several hours after prosecutors charged sacked white police officer Derek Chauvin with third-degree murder and manslaughter.

Scores of arrests in New York

Thousands of protesters stormed the perimeter of Barclays Centre in New York.

Police made scores of arrests at the massive demonstration in Brooklyn, loading cuffed protesters onto city buses lined up on Atlantic Avenue, shutting down a major thoroughfare.

A diverse group of protesters cheered to hip hop music and tried to argue about police brutality with police officers in riot gear, who occasionally lunged into crowds to pluck people out for arrest after bottles and other projectiles were thrown.

Protesters gather during a "Black Lives Matter" protest near Barclays Center on May 29, 2020 in the Brooklyn borough of New York City, in outrage after George Floyd, an unarmed black man, died while being arrested

Protesters gather outside the Barclays Centre in New York. Photo: AFP

The demonstrators at the “We can’t breathe” vigil and rally in lower Manhattan were pressing for legislation outlawing the police “chokehold” used by a city police officer in the 2014 death of Eric Garner, who was also black.

Hundreds in Detroit joined a “March Against Police Brutality” late in the afternoon outside the Detroit Public Safety Headquarters. Many chanted, “No justice, no peace.” Some carried signs that read, “End police brutality” and “I won’t stop yelling until everyone can breathe.”

In Denver there was a second day of protests as hundreds marched peacefully through its downtown demanding justice for Floyd.

On Thursday night, Denver police fired tear gas and rubber bullets to disperse crowds after parked cars were vandalised. There were 13 arrests related to the protests.

There have also been demonstrations elsewhere, including Los Angeles, Chicago, Houston, Louisville, Phoenix, Columbus and Memphis.

Frustration was already simmering over the recent deaths of two other black Americans, Ahmaud Arbery in Georgia and Breonna Taylor.

Police officers cuff a protestor during a "Black Lives Matter" protest near Barclays Center on May 29, 2020 in the Brooklyn borough of New York City, in outrage after George Floyd, an unarmed black man, died while being arrested

Police arrest a protester in New York. Photo: AFP

Trump speaks to victim’s family

At the White House today, President Donald Trump called the incident “a terrible, terrible thing” and said he had spoken with Floyd’s family, whom he described as “terrific people”.

He said he had asked the justice department to expedite an investigation it announced today into whether any civil rights laws were violated in Floyd’s death.

The president also said “looters should not be allowed to drown out the voices of so many peaceful protesters”.

Earlier, he described the rioters as “thugs” who were dishonouring Floyd’s memory.

Social media network Twitter accused Trump of glorifying violence in a post that said: “When the looting starts, the shooting starts.”

– Reuters / BBC