exactly what happened and also try to figure out why people were not able to get out. why so many people had to be treated on-site and, of course, why eight people died. >> hmm. very sad. rosa flores. we talk more about this with the mayor of houston. a mayor, sylvester turner. mr. mayor, so good to see you. sads sadly under these circumstances. this is heartbreaking. what are you learning what happened and how this happened? >> it was a sold-out crowd last night, fredricka. there were at least 50,000 people that were there. we are certainly looking at all of the video footage. we are talking to witnesses. we are talking with the event organizers. this happened at one. county facilities last night. so we're looking at everything. we even want to visit with some of the people who were taken to the hospital, and our numbers