Tags: Jay Nixon

Authorities declared a state of emergency in Ferguson, Missouri, on Monday to prevent a repeat of the violence that erupted during protests overnight to mark the police shooting of an unarmed black man one year ago that ignited a national firestorm on race relations.

The white police officer who fatally shot an unarmed black teenager in a St. Louis suburb has resigned, his lawyer said on Saturday, as activists set out on a 120-mile march to protest the killing and a grand jury's decision not to indict him.

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.