Police in Ferguson, Missouri, have reported heavy gunfire at a protest on the first anniversary of the killing of unarmed black teenager Michael Brown.
St Louis County police said an officer was “involved in a shooting after coming under heavy gunfire” and that “two unmarked cars took shots”.
The violence came at the end of a sombre, peaceful day of commemorations.
The shooting of the 18 year old by white police officer Darren Wilson sparked demonstrations across America.
It fuelled a national protest movement against racial bias by the police.
Earlier on Sunday, hundreds of people stood silent for four and a half minutes at the spot where Michael Brown was killed, representing the number of hours that his body lay in the street, unattended.
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Source: BBC