More National Guard troops and police have been sent to Ferguson, Missouri to head off a third night of violence, as over 400 people have been arrested in the St. Louis suburb and around the United States in unrest after a white policeman was cleared in the killing of an unarmed black teenager.
Riot-gear clad police arrested at least 17 people on Sunday after they refused orders to disperse from a spontaneous sit-in outside a convenience store in St. Louis during a weekend of otherwise peaceful protests against police violence.