PORTLAND, Maine (NEWS CENTER) -- Investigators have finished talking with some of the neighbors in the area of this weekend's deadly Orrington fire.

None of them report hearing smoke detectors going off.

Benjamin Johnson and his three children, Ben, Ryan, and Leslie all lost their lives in Saturday's fire. The only survivor was Christine Johnson, who escaped by climbing onto the roof.

South Portlandfirefighter Robb Couture says having working smoke detectors in the home is the cheapest form of life insurance anyone can buy.

According to the National Fire Protection Agency, families should have one in every sleeping area and one on every level of the home. He saysthe smoke detectors should beinterconnected so that when one alarm goes off, they all do.

He says many hardware stores these days have more advice on which smoke detectors to install and where -- some are designed to withstand humidity, while some aren't.

Couture says if you have kids, it's important to include them in testing the smoke detectors on a regular basis, that way they get used to the sound, and it's less scary to them if they hear it in a real scenario.

He also says you should come up with an escape plan, show your kids how to get out of the house if there is a fire, and come up with a meeting place outside.

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