A US grand jury has found former Minneapolis police officer Derek Chauvin guilty on all three charges he faced over the custodial death of African-American George Floyd last year, a chilling incident that sparked worldwide protests against racism and excessive use of force by police.

The 12 jurors found Chauvin, 45, guilty of unintentional second-degree murder, third-degree murder and second-degree manslaughter in one of the most closely watched cases in recent memory in the US.