"More Will Be Assassinated In The Coming Days! Do You Like The Work Of Our Assassins? Get Your Own Sniper" read a post on the Black Power Political Organisation Facebook account A self-proclaimed black power group appears to have claimed responsibility for the assassinations of five police officers at a Black Lives Matter protest in Dallas. Five officers were gunned down by at least two shooters who picked out officers from an 'elevated position' - believed to be a multi-storey car park. It came in the week of public outrage over the deaths of two black men shot by police....