Documents and video evidence provide a detailed -

The killing of George Floyd on May 25 has triggered unprecedented protests in the United States, with curfews being imposed in cities across the country and President Donald Trump briefly evacuated to a bunker during a night of violent demonstrations.

One former police officer involved in the killing, Derek Chauvin, has been charged with second-degree murder and manslaughter. Three other officers at the scene - Thomas Lane, J. Kueng and Tou Thao - were charged with aiding and abetting second-degree murder. All four of the officers had already been fired.