Police used smoke bombs and tear gas to disperse demonstrators who defied a curfew in Ferguson, Missouri, early on Sunday, where a fatal police shooting of an unarmed black teen triggered a wave of rioting.

Missouri Governor Jay Nixon declared a state of emergency and a curfew starting at midnight on Saturday until 5 am for the St. Louis suburb of Ferguson, where 18-year-old Michael Brown was shot dead by a white police officer on Aug 9.

Ferguson was mostly peaceful when the curfew began on Sunday, but a crowd of protesters gathered in the area where Brown was shot and refused to disperse.