Some 200 protesters have clashed with police in Ferguson, in Missouri, as tensions boil over again following the death of a black teenager a week ago.

The 18 year old Michael Brown was shot by police. Brown was unarmed and his family says he was trying to surrender with his hands up.

Police say he was a suspect in a convenience store robbery minutes before the fatal confrontation.

The latest unrest came despite an appeal for calm by Mr Brown's relatives.