Police have named Darren Wilson as the officer who fatally shot unarmed teenager Michael Brown in Missouri.
Ferguson Police Chief Thomas Jackson made the announcement at a press conference.
Jackson also released documents that claim the teen was killed after a robbery in which he was suspected of stealing a $48.99 (£29) box of cigars.
Ferguson police had previously withheld the name of the officer involved citing security concerns.
The shooting of the black 18 year old has led to racial tensions and protests in the St. Louis suburb of Ferguson where Brown was killed.
More top news
The Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.