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US protesters forced a crowded St Louis mall to close Friday, marching through the complex demanding a boycott to post-Thanksgiving shopping and justice for an unarmed black teenager killed by police. Scores of demonstrators, including young children, shouted "No justice, no peace," and "Stop shopping and join the movement" at the St Louis Galleria Mall. Around 100 people lay on the floor for several minutes to symbolise the more than four hours that 18-year-old Michael Brown lay in the road after being shot dead by a white police officer in the St Louis suburb of Ferguson. Black Friday comes the day after America's Thanksgiving holiday and sees stores offering steep discounts, leading to often-frenzied consumer spending.