VIDEO: More than a dozen arrested in clashes with police in Ferguson

Police arrested more than a dozen people in Ferguson on Monday, in the US state of Missouri, after protesters blocked traffic during a fourth consecutive night of demonstrations marking the one-year anniversary of the fatal shooting of Michael Brown.

It came after a morning demonstration along West Florissant Avenue that was interrupted by gunfire and a police shooting that left an 18-year-old critically injured, setting the St. Louis suburb on edge.

A state of emergency is in force in Ferguson.