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Scott at the rafto world music festival in houston. the crush of people squeezing other audience members who had nowhere to go. video from the sold out event shows the moment the performer pauses and looks on in confusion as an ambulance moves in the densely packed crowds of about 50,000. and the houston police say there are still plenty of unanswered questions. they call it an active investigation. joining me now is marty booth, public information officer for the houston fire department. thanks so much for joining us tonight. the houston fire chief said a security officer who appeared to be i...

Maybe about 200,000. but that is also going to be under investigation by entities in our agency and that is about all i can say about that. >> all right. marty booth, thanks for joining us. we appreciate it. cnn's rosa flores is in houston for us tonight. what have eyewitnesses been telling you, rosa? >> reporter: you know, pam, a lot of troubling details. some of the eyewitnesses both adults an teens and children say they were very concerned and there were very tense moments. some of them telling me that pending on how tall they were, that is about how much oxygen they were able to get. now...