PORT ANGELES — Two adults and three children were displaced following a house fire in the 1600 block of West Sixth Street in Port Angeles.

The origin and cause of the fire, which began late Wednesday night, are still under investigation, Port Angeles Fire Chief Derrell Sharp said.

A passerby saw heavy smoke and flames pouring from the building Wednesday night.

When firefighters arrived, they confirmed all occupants were out of the building and then worked to contain the fire.

The fire department requested medical aid to provide on-scene treatment to the two adults.

One received treatment for minor burns and one was evaluated for possible smoke inhalation, Sharp said.

Neither adult required further care or to be transported to a hospital, Sharp added.

The fire was brought under control about 1:15 a.m. and declared out about 2:30 a.m. Thursday, Sharp said.

The displaced individuals were connected with the Red Cross by 2 a.m. Thursday, he added.

The incident received mutual aid from Clallam County Fire District 2, which provided two engines and an aid car. The Port Angeles Police Department and Clallam County sheriffs deputies also responded.

The Port Angeles Fire Department provided one engine, one medic vehicle and six personnel, Sharp said.

Once the fire was brought under control, Sharp said firefighters were limited in overhaul and mop-up operations due to structural integrity issues with the building.

About 8:25 a.m. Thursday, the Port Angeles Fire Department returned to the scene to extinguish a couple small flare-ups.

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Reporter Emma Maple can be reached by email at emma.maple@peninsuladailynews.com.