UPDATE: A large house fire in south Chattanooga has been ruled arson. 

Police shut down roads near Fagan Street for several hours when the fire broke out at about 5:15 a.m.

No one was home at the time. Officials said homeowners were renovating the house and living elsewhere.

Large flames danced through the roof of this home in Chattanooga as the attic burned below and became too dangerous to fight the fire from inside.

"When the roof started showing signs of caving in, the incident commander called the firefighters back out and they caught the fire defensively to contain the fire and prevent it from spreading anywhere else,” Bruce Garner with Chattanooga Fire said.

The fire spread to power lines running to the house that added even more danger to the firefighters who spent several hours at the scene.

"They had a live power line that broke loose, it was laying in the front yard it was popping and cracking and firefighters had to avoid that too because it was a real hazard for them,” Garner said.

Herbert Adams lives nearby, he said the home has been under construction and empty for several months.

"I seen them out there working, I seen them put a new porch on it and new siding and I seen someone up there yesterday up on a ladder on top and I don't know what they were doing because I don't stop and ask no questions,” Adams said.

The owner tells Channel 3, he was less than a month away from completing those renovations and had just canceled his insurance.

Firefighters were able to contain the fire from spreading to any nearby residences.

The home is a total loss, investigators have not said if there are any suspects at this time.

Stay with channel 3 as we follow this investigation.

PREVIOUS UPDATE: Officials say a fire investigator with the Chattanooga Fire Department believes this morning's fire at 4212 Fagan Street was deliberately set.

The fire is currently under investigation. Stick with Channel 3 for the latest updates.

PREVIOUS STORY: The Chattanooga Fire Department responded to a house fire early Friday morning at 4212 Fagan St. 

It happened around 5:15 a.m.

The Chattanooga Police Department, Hamilton County EMS, and three other fire companies also responded to the scene for mutual aid.

Officials say a live power line detached from the home, and a technician was called to the home to shut down the power to that line.

No injuries were reported in the fire, and officials say the home was unoccupied at the time of the fire.

The house is considered a total loss, and the cause of fire is currently under investigation.