One police officer is dead and at least two others injured after a shooting in Colorado Springs, local media reports.

Demonstrators carried signs, chanted and marched in a peaceful protest hours after the family of a black man shot by police released video showing the events leading up to his death.

Video of a deadly encounter between Charlotte police and a black man shows his wife repeatedly telling officers he is not armed and pleading with them not to shoot as they shout commands to drop a gun.