Transcript for 3 firefighters rescued when floor collapses during Dallas blaze
There was another scare that played out today, this time, in Dallas. And it was very real. More than 100 firefighters racing to the scene when a condominium went up in flames. Those firefighters going door-to-door, pounding on them to get families out. Part of the building then collapsing, and a may day call going out. Several firefighters were trapped. ABC's Marcus Moore is on the scene tonight. Reporter: It started at 9:15 this morning. We got a lot of smoke inside. We got a lot of people. We need to start evacuating these buildings. Reporter: This Dallas condos engulfed in an inferno. Firefighters going door-to-door, racing to get families to safety. Red hot flames sending residents scrambling. Things started imploding. You could see people's stuff going up in smoke. Reporter: Parts of the building collapsing. As more than 100 firefighters work to douse the flames. There are times when the smoke is building and choking as this fight continues. At one point, the roof collapse and three firefighters had to be rescued. Fourth alarm. We have a mayday at this time. Reporter: These firefighters were essentially trapped? They were trapped inside. It was a floor that was above them that collapsed into the unit that they were in. And it cut off their means of egress. Reporter: A rapid intervention item finding those firefighters, finally pulling them from the building. And Marcus Moore joins us live from the scene there in Dallas. And Marcus, those firefighters are all end pegted to be okay? Reporter: That's right, David. All three firefighters and a resident were treated for injury. They are expected to be okay. One official told me if it had not been for that ramd intervention team going in so quickly, David, this would have been far worse. Just an incredible scene playing out in Dallas today. Marcus, thank you.
This transcript has been automatically generated and may not be 100% accurate.