Gang Related! this is the news broadcast that tells you about it. It looks like an undercover Police opporation went wrong, ending in a firefight which killed a well know Gang member...this started a Riot
Tottenham is a little section of one of the Boroughs classed as Greater London, its around the same area as Walthamstow, which is North beyond Camden which is the barrier to central London so to speak. I've never been to Tottenham, but I went, just once, to Walthamstow to visit a friend.