UPDATED 11/02/11 9:35 a.m.

WHEATON, Ill. (CBS) — Investigators are probing the cause of an extra-alarm fire that broke out early Wednesday morning in Wheaton.

The fire broke out just after midnight in an unoccupied home at 619 Frazier Ct., authorities said.

When firefighters got to the house, they found flames roaring on a porch, and spreading rapidly was rapidly up to the attic. Firefighters used numerous hose lines and an aerial ladder to extinguish the fire, which took about an hour to get under control.

As many as 100 firefighters had to respond to the scene to put out the second-alarm fire, authorities said.

The house, which appeared to be undergoing remodeling, was unoccupied at the time of the fire. There were no injuries, the fire department said.

The cause of the fire is undetermined so far, but investigators from the Wheaton Fire Department and the DuPage County Fire Investigation Task Force are probing the cause of the blaze.

Damage to the home was extensive, particularly the roof. The exact value of the loss was not known Wednesday morning.

The Sun-Times Media Wire contributed to this report.

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