Tens of thousands of demonstrators massed in Washington and other U.S. cities on Saturday demanding an end to racism and brutality by law enforcement, as protests sparked by George Floyd's fatal encounter with Minneapolis police stretched into a 12th day.

A Lincoln Memorial rally and march to the White House marked the largest outpouring yet of protests nationwide since video footage emerged showing Floyd, an unarmed black man in handcuffs, lying face down and struggling to breathe as a white police officer knelt on his neck.