KOSIK: Now to what Houston, Texas Mayor Annise Parker is calling the worst day in the history of her city's fire department. Four Houston firefighters died yesterday after a hotel wall collapsed on them while they fought a major fire. 13 other firefighters are being treated at hospitals. Houston's fire department is the third largest in the country. I want to bring in Sara Ganim who's in Houston, she's been covering this. Sara, can you tell us a little bit more about the firefighters who lost their lives in this?</s>SARA GANIM, CNN CORRESPONDENT: Yes, Alison. You know, Anne Sullivan was just 24 years old. She graduated from the fire academy just in April. She was one of the four who died when one of the walls collapsed in the building behind me as it was on fire. These firefighters ran in thinking there were people in there that needed to be rescued. Along with Anne, Robert Garner, he was 29 years old; Robert Bebee, 41 years old; and Matthew Renaud, he was 35 -- Alison.</s>KOSIK: Do we know at this point what caused the fire that started in the restaurant?</s>GANIM: Yes. This is actually two buildings that are adjacent to each other in one. It was a restaurant and then an inn. And early this morning, fire officials were telling me that they believed that the fire, based on where they could see the flames when they arrived, and based on witnesses did start in that restaurant area. But I have to tell you, Alison, there's almost nothing left of this building. You can see from some of the footage this morning, it just completely collapsed in on itself. The fire consumed this building and it definitely spread and encompassed the entire structure. There's really not much left except rubble this morning.</s>KOSIK: All right. Sara Ganim, thank you. Tornadoes hit Oklahoma City overnight. And now teams are assessing the damage today. We're going to be getting a live report.
Massive Blaze Kills Four Firefighters in Houston