The police officer who shot dead unarmed black teenager Michael Brown will not face charges, a grand jury has ruled.
Michael Brown was shot dead by white Missouri police officer Darren Wilson in Ferguson, Missouri in August.
The 18-year-old's death led to violent protests in the St Louis suburb and police are preparing for further unrest following the announcement.
Bob McCulloch, the St Louis County prosecutor, said many witnesses admitted that they did not actually see the shooting.
Armies of protesters took to the streets following the Ferguson shooting decision, in a sign of the monumental challenge now facing America.
The police officer who shot dead Michael Brown says he has a clear conscience over his actions.