Bellevue firefighters still don’t know if anyone was inside a house that was totally destroyed by fire and explosions early Sunday.

The house, located west of Enatai Beach Park in the 3200 block of 112th Avenue Southeast, was burned beyond repair, Lt. Troy Donlin said in a news release. The first neighbor to call 911 reported that the entire house was engulfed in flames, and other residents reported hearing a series of explosions, he said.

When firefighters arrived on the scene, portions of the roof and second floor had collapsed, making the house too dangerous to enter, according to Donlin. It took crews from Bellevue and Mercer Island 38 minutes to get the blaze under control.

Though three vehicles were found in the garage, Donlin said investigators don’t know if anyone was inside at the time and attempts have been made to contact the homeowner.

Fire and police investigators are working to determine the cause and origin of the fire and have requested that a structural engineer help determine the safest way to investigate the house’s interior, Donlin said.

A damage estimate was not immediately available.