Honolulu firefighters are investigating the cause of a fire that broke out early Saturday at a single-story home in Kailua, according to the Honolulu Fire Department.

The department’s 34 firefighters responded to the fire at 2:27 a.m. Saturday. Firefighters discovered flames exiting the left side of the home at 1604 Ulupii Place.

A mother and her son were at home with their dog when the fire broke out. Neighbors alerted them about the fire.

Firefighters extinguished the blaze by 4:12 a.m.

“Everyone got out safely,” Honolulu Fire Capt. Scot Seguirant said. No one was injured.

The residents did not have smoke detectors. Seguirant urges all residents to install working smoke detectors in their homes.

“Having a working smoke alarm in your home will increase your chances of survival from a fire by more than 50 percent,” Seguirant said in an email.

The estimated cost of the damage was not immediately available.