Police call for reinforcements as St Louis protesters storm City Hall

Several people protesting against a grand jury decision not to indict a police officer over the fatal shooting of an unarmed black 18-year-old stormed into City Hall in St Louis, leading police to lock down the building and call in more than a hundred additional officers.

Those who made it inside City Hall were part of a group of about 200 protesters who marched and held a mock trial of Darren Wilson, the white police officer who shot and killed Michael Brown during a confrontation in Ferguson, a St Louis suburb.