Demonstrators have gathered in London after the death of a black man in the US which has seen a police officer charged with third-degree murder.

Dozens of protesters chanted as they marched in Peckham, in the south-east of the capital on Saturday.

Some of those taking part carried placards reading “solidarity” and “Black lives matter”.

The handcuffed black man died after a white police officer knelt on his neck for several minutes.

Video of the arrest, which has gone viral, shows Mr Floyd begging for air and saying, “please, I can’t breathe” and “don’t kill me”.

Criminal charges were filed on Friday against white police officer Derek Chauvin, 44.

He has been charged with third-degree murder and second-degree manslaughter.