At a press briefing about 1:30 a.m., St. Louis County Chief Jon Belmar said four of the arrests were on felony charges, one related to a weapon and the others to assaults on officers.
He said two guns and one Molotov cocktail were seized over the course of a night that also saw some incidents of vandalism, including the torching of a police car and the breaking of windows at City Hall and at some businesses on West Florissant Avenue.
Tear gas was used to disperse the crowd at City Hall, Belmar said, but nowhere else.
He said officers and Guardsmen showed restraint despite being the targets of projectiles that included rocks, pieces of asphalt and bottles filled with urine. There was little gunfire on the streets, he said.
Both Belmar and Missouri Highway Patrol Capt. Ronald S. Johnson said the night's chaos was far from that of the night before. "We did have a much better night," Johnson said.
In addition to the tripling of the National Guard contingent to more than 2,000, Belmar and Johnson credited revisions in their policing strategy for the more peaceful night. Part of that strategy included closing the stretch of West Florissant Avenue between Chambers and Soleway, where some of the businesses hit by arsonists the night before were still smoldering.
