>> the night started peacefully but, as you saw, things got pretty tense. some demonstrators refuse to do leave and protesterswere unhappy with a judge's decision to acquit former st. louis police officer jason stockily in the 2011 shooting death of anthony lamar smith. cnn's ryan young was in st. louis as the violence started. >> reporter: we are on delmar boulevard. if you look behind me. you can see the heavy machinery behind me that the police brought in here. there is a bearcat. the officers in their riot gear. about 50% of the businesses are coming down delmar boulevard look like they suffered some sort of damage. the organizers told peaceful marchers to go home, but a half hour after that, we saw another group that decided to stay here. that started to build and there was a confrontation between police and those protesters. at this point, someone started throwing rocks and bottles at the officers and started breaking out windows of businesses.