A newly disclosed surveillance video from the hours before the killing of a black man in Ferguson, Missouri, in 2014 has triggered fresh protests. A filmmaker has released the footage which he says shows Michael Brown did not rob a shop, as police claimed, but instead exchanged marijuana for cigars. He says it contradicts video released by police showing Brown threatening the shopkeeper as he walks out with cigars. The 18-year-old was shot dead by a police officer moments later. However, the convenience store maintains it was a robbery. Policeman Darren Wilson was cleared of wrongdoing by investigators but the...