Hot temperatures turned an already intense situation even more dangerous in Clark County.
Some firefighters trying to battle flames in an apartment building also had to deal with soaring temperatures Tuesday morning.
The fire broke out on Winn Avenue in Winchester.
"We looked and the sky was filled with smoke and then my mamaw's house was on fire and I just went ballistic," Michaella Dunn, the granddaughter of a fire victim, said.
Firefighters say they had to cut out part of the wall to get to the fire. They also had to call in reinforcements so they could work in shifts of 10 to 15 minutes.
One person even brought them Gatorade to help keep them hydrated.
Some firefighters had to be treated for heat exhaustion. No one else was injured.
The Red Cross is putting the people who lived in those apartments in hotel rooms.
Investigators say they're still trying to determine what caused the fire. They do say it started in either the roof or the back exterior wall of the building.