SEATTLE (AP) — Police used flash bang devices and pepper spray to disperse a crowd of protesters in Seattle Saturday night after authorities said rocks, bottles and explosives were thrown at them. Police said via Twitter that several officers were injured by “improvised explosives.” The mayhem in the city’s Capitol Hill neighborhood followed a large, peaceful demonstration earlier in the day with medical workers protesting against racism and police brutality. It also came a day after Mayor Jenny Durkan and Police Chief Carmen Best imposed a 30-day moratorium on the department’s use of one kind of tear gas. KING-TV reports that a small group of protesters started throwing objects at officers about 7:30 p.m. Saturday. Police ordered the crowd to move, then used incendiary devices.