 to try and create a complete picture of what happened here at that shooting. We have heard from witnesses, Charlie, who said they pointed the shooter out before he opened fire. How did law enforcement react? What are we learning about that? And sources also telling us that law enforcement did identify that shooter before he got on the roof. Sources telling us that they spotted the 20-year-old using a rangefinder and that he had a backpack, but before it was able to be communicated.