DULUTH, Ga. -- Just a day after a fire inside a Duluth home tragically killed five people, 911 calls made to police offer a glimpse into the scope of the fire.

On Sunday, firefighters responded to a home on Post Oak Drive to find the structure fully engulfed in flames. Crews had to battle the raging fire from above in order to bring it under control and get inside the house. Once they did, they found the bodies of three people. It wasn't until later in the day that they found the bodies of two more people.

Officials have not yet released the names of the victims.

On Monday, investigators released the 911 calls made by neighbors, which show how intense the flames were at the height of the fire.

The neighbor who called 911 told the operator that she heard a big boom before going outside to investigate. The caller tells the operator that "the whole house is on fire...it's huge, it's a blaze."

"Do you know if anyone's inside the house," the operator asks the caller at one point.

"If anybody's in there, I don't know how they survived," the caller replies. "Oh my God."

The caller then went next door to wake her neighbors up, fearing their house, right next door to the fire, would also go up in flames.

Shortly after, the caller reports hearing an explosion, and the the operator tells them to stay back for their safety. "Make sure everybody is a safe distance away," she tells them.

Eventually firefighters made their way to the scene and were able to contain the fire, but not before the main floor of the home collapsed. Investigators are still looking into the cause of the fire, but have indicated that a fire pit in the back porch area may have been a potential source.

Investigators said they received a total of five 911 calls from neighbors, and received one from inside the home. They have not released that call at this time.

PHOTOS | 3 killed in Duluth house fire