The Honolulu Fire Department said it is investigating a house fire in Mililani this morning that killed a family dog.

More than 30 firefighters responded to a 911 call at 5:14 a.m. for a fire at the home at 95-773 Paikauhale St.

When the first units arrived five minutes later, they found a single-story residence with flames visible from the front of the home.

HFD officials said firefighters initiated an “aggressive” attack on the blaze while also searching the house for occupants.

While no humans were found inside, HFD said two family dogs were located and extracted from the residence. After administering oxygen to both animals, one of the dogs died at the scene.

The fire was reported to be under control at 6 a.m. and extinguished at 6:47 a.m., fire officials said.

Three people who live in the house escaped and were uninjured, HFD said. While the residence was equipped with smoke alarms, they reportedly did not sound or alert those inside.

A fire investigator was called to the scene today to help determine the fire’s origin and cause. No damage estimates are currently available, HFD said.