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.
The governor of the US state of Missouri has activated the state's National Guard in anticipation of a grand jury decision over the killing of an unarmed black teenager. In a statement, Jay Nixon said the guard will support law enforcement's efforts to maintain peace.