Dozens of people were forced out of their homes after a 3-alarm fire ripped through an Irving apartment building late Tuesday night.
Firefighters said extreme temperatures affected how they attacked the blaze.
About 40 firefighters fought the fire at the Parkridge Apartments on Parkridge Boulevard for more than an hour. They said high humidity played a role in how they attacked the flames. Crews called in extra firefighters to make sure firefighters felt fresh and hydrated while battling the blaze.
"We have a lot of humidity. It's not that hot, but there's a lot of humidity. And we're going to struggle with that when we're out on something of that magnitude. So we had to get some more manpower here to help," said Irving Assistant Fire Chief Rusty Wilson.
One resident had to go to the hospital with cuts to his head.
Neighbors said the situation could have been much worse. NBC 5 spoke with one man who ran across the street late last night to bang on doors and yell "fire" to wake people up.
"A lot of people were surprised when they came outside and finally saw it. One guy thanked me for knocking on his door to get him out," said Leonid Semenenko.
Investigators don't know how the fire started.