SANTA ROSA (KRON) — Thirty people were temporarily displaced when a three-alarm fire damaged an apartment complex in Santa Rosa Sunday morning.

Firefighters responded to a report of a fire at 2921 Bay Village Circle at 7:46 a.m., according to Santa Rosa fire officials.

When firefighters arrived, they spotted smoke coming from an apartment unit on the first floor, fire officials said.

Firefighters entered the building and heard a disabled woman calling for help. They were able to safely rescue the woman from the smoke-filled apartment.

Because of the building’s construction, the fire quickly spread and intensified once it reached the second floor and attic, fire officials said.

After an aggressive effort, fire crews were able to extinguish the fire, according to fire officials.

The building’s occupants are receiving assistance from the American Red Cross and the apartment complex’s management.

One firefighter suffered a broken bone in the right hand while battling the blaze, fire officials said.

Residents told investigators they smelled smoke in the building about 45 minutes before the smoke detectors were activated, indicating the fire may have been burning for a while in an unchecked area, according to fire officials.

The cause of the fire is still under investigation, but said it appears to have been electrical in nature.

Damage caused by fire is estimated to be about $950,000, fire officials said.Bay City News contributed to this article