Clashes in Ferguson see police use tear gas
19 August 2014 Last updated at 06:54 BST
The police used tear gas and stun grenades after minor clashes with protestors in Ferguson, Missourri demonstrating over the killing of Michael Brown.
The black 18-year-old was shot several times in the St Louis suburb by white policeman Darren Wilson, sparking racial tensions in the area.
Mr Wilson has been suspended but not arrested or accused of any crime, increasing the anger of some protestors in Ferguson.
Emily Thomas reports on how the peaceful demonstrations ended in violence.