A demonstrator hurls a tear gas canister back towards police lines in Fergusson, Missouri, after an apparent peaceful demonstration was broken up by heavily armed police officers overnight.
Police chief Thomas Jackson, who has been the public face of the city torn by the death on Saturday of Michael Brown, 18, said earlier that the St Louis County investigation of the shooting could take weeks to complete.
More top news
Girls should swap dolls for toys such as Lego and Meccano to get them more interested in science and engineering, top scientist claims.
A mother feared to have been planning to travel to Syria with her four children has been arrested after returning to the UK.
Labour leadership contender Yvette Cooper has accused Jeremy Corbyn of not being straight with people over the economy.