witnesses who described a long series of automatic gunfire before hearing two pop pop, and then the entire shooting scenario was over just outside of the building. they were on lockdown for some time. but there was a great deal of security here last night, carol. in fact we were told there was layers of security to get inside into the event. and then we were told by law enforcement officials that there was also a s.w.a.t. team waiting in the back of the building for a scenario just like this. carol? all right. ed lavandera reporting live from garland, texas, this morning. i want to bring in rosa flores now. she s been digging into what we know about the suspects. tell us more. carol, i want to start off with just the fact that the fbi is saying that they knew about this guy. that they had been tracing him, and this is information that my colleague susan candiotti has been able to dig up for us this morning. but the fbi had been monitoring this guy. they had been following him. and