Firefighters extinguished a two-alarm residential structure fire in Kaimuki early Monday that was caused by an unattended cigarette.

The fire occurred at a two-story duplex on the 3500 block of Keanu Street at about 5:21 a.m. About 32 firefighters responded and quickly brought the fire under control at 5:38 a.m. The fire was extinguished at 6:02 a.m.

Ten people who were home at the time of the fire evacuated without any injuries, said Honolulu Fire Department spokesman Capt. David Jenkins.

Jenkins said a resident was smoking a cigarette and fell asleep. The fire was isolated to a bedroom on the second floor.

There were no smoke detectors in the home.

The estimated damage to the home has yet to be determined.

Jenkins reminded the public that every room in a home should have a smoke detector. It is also recommended, should a fire occur, to close bedroom doors while evacuating to help contain the fire.