Tags: Michael Brown

Protesters in Ferguson, Missouri began targeting Black Friday sales at major retailers overnight in a new tactic to vent their anger at a grand jury decision not to indict a white police officer who fatally shot an unarmed black teen.

National Guard troops and police aimed to head off a third night of violence on Wednesday in Ferguson, Missouri, as more than 400 people have been arrested in the St. Louis suburb and around the United States in civil unrest after a white policeman was cleared in the killing of an unarmed black teenager.

Missouri's governor ordered hundreds more National Guard troops on Tuesday to the St. Louis suburb rocked by rioting after a white policeman was cleared in the fatal shooting of an unarmed black teenager, while the local mayor said the governor did not do enough to protect businesses from looting.