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
A look ahead to the forecast for today across the UK.
People have been warned to prepare for cold weather as ice and snow is set to hit parts of the UK.
There is concern that the lack of clean water could add mean more people fall victim to the worst recorded cholera outbreak in history.