George Floyd

Tens of thousands of people marched in Washington DC, in the city's largest protest so far. Security forces blocked any approach to the White House.

Crowds also demonstrated in New York, Chicago, LA and San Francisco.

Meanwhile, people paid their respects to Mr Floyd in North Carolina, where he was born, before a memorial service.

Mr Floyd, an unarmed black man, died in police custody in Minneapolis on 25 May. Video showed a white police officer kneeling on his neck for almost nine minutes while he is pinned to the floor.

BBC News had highlighted some suspicious groups had switched their focus to call for justice for the black man killed in police custody.

Some, run by accounts seemingly based in Vietnam or Bangladesh, had posted misleading images.

And others had previously focused on coronavirus, 5G conspiracies and support for US President Donald Trump.

A Facebook spokesman said it had "removed the vast majority of them, for violating our policies".

The charge against Derek Chauvin has been elevated to second-degree murder, court documents show.

The other three officers, previously uncharged, face counts of aiding and abetting murder.

Floyd's death has sparked huge protests across the US against racism and the police killings of black Americans.

The vast majority of demonstrations over the past eight days have been peaceful, but some have turned violent and curfews have been imposed in a number of cities.

He suffered a cardiac arrest while being restrained by Minneapolis police officers on 25 May, the report found.

It listed Mr Floyd's cause of death as "cardiopulmonary arrest complicating law enforcement subdual, restraint, and neck compression".

The examination also showed he had heart disease and recent drug use.

The findings of the official post-mortem were released shortly after those of a private examination carried out by medical examiners hired by the Floyd family.