toward the gunmen and engaged them in a firefight. seconds later, the officer was hit, and the gunman fled. the shooting started at about 8:45 p.m. central time just as the peaceful protest was ending. chants turned to screams as the crowd ran for cover. eyewitnesses reported shots coming from above. >> we had to turn around and go the opposite direction. so natural instinct kicked in, and we started telling people to go back that way. >> we have a guy with a long rifle -- we don't know where the hell he's at. we've got one more shooter out here. >> there's one on the wall with