FERGUSON, Mo. -- St. Louis County has lifted the state of emergency that was imposed in Ferguson and the surrounding area after shootings during protests to mark the one-year anniversary of Michael Brown's death.

County Executive Steve Stenger's announcement Friday followed the third straight night of calm in the St. Louis suburb. Stenger said in a statement that police will remain vigilant.

Stenger issued a state of emergency Monday after gunfire and violence erupted during demonstrations related to the anniversary of the 18-year-old Brown's death.

Brown, who was black, was fatally shot by white Ferguson officer Darren Wilson on Aug. 9, 2014. Wilson was not charged, and the shooting spurred a national "Black Lives Matter" movement.