the community of dayton, ohio is reeling after the early morning mass shooting that left 9 people dead and 27 injured. as the city tries to heal, police are investigating the shooting and the shooter's motive. we're also getting new video showing the moments when the gunshots rang out. this is from a surveillance camera in downtown dayton where people had been enjoying a night out. you can see the chaos. people diving for cover and running to try to escape the gunfire. at least one person seen in the video was hurt. police have identified the suspect as a 24-year-old white male. he was shot and killed by police. joining us now, cnn law enforcement analyst, former washington, d.c., police chief, charles ramsey. also julia cayenne, a former assistant secretary at the department of homeland security and cnn's crime and justice reporter shimon prokupecz. you've been doing a lot of reporting on this. what is this new video tell us about how this shooting unfolded.