Hundreds of people marched, prayed and observed a moment’s silence to mark one year since the death of 18-year-old black teenager Michael Brown.
The death of the unarmed teenage who was shot dead by a white police officer,ignited months of riots and demonstrations across the country.
But the peaceful vigil have turned violent after at least two shooting incidents involving police officers were reported.
Gunfire was heard as police in riot gear clashed with protestors blocking traffic during the rally.
At least one demonstrator is said to have been injured.