A lawyer for the family of George Floyd, whose death sparked unrest across the US, has accused his killer of “premeditated murder”.
The authorities in the city of Minneapolis, Minnesota, have charged the police officer, Derek Chauvin, with third-degree murder, but lawyer Benjamin Crump told CBS news his action was a case of first-degree murder.
“We think that he had intent… almost nine minutes he kept his knee in a man’s neck that was begging and pleading for breath,” he said.
Looting is ongoing in the city of Philadelphia, says the BBC.
On Sunday, two Philadelphia TV stations showed videos of angry youths smashing several police cars and looting at least one store.
The Philadelphia Inquirer Newspaper also reported that police cars were set alight in the West of the city.
Several US cities have imposed curfews as a result of the violence, and the National Guard has been deployed in some trouble-spots in an attempt to bring the situation under control.
In a series of tweets, President Donald Trump called for the restoration of law and order. At one point, he threatened to use troops to quell the violence, but later retracted the statement.
The Floyd case in Minneapolis has reignited US anger over police killings of black Americans.
It follows the high-profile cases of Michael Brown in Ferguson, Eric Garner in New York and others that have provided the catalyst for the Black Lives Matter movement.