BATH — The Maine fire marshal’s office says no charges will be filed in a home explosion that killed a woman in Bath.

A leak in a propane line caused the explosion. WMTW-TV reports that the fire marshal’s office said Tuesday that the case is not closed.

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Fire investigators say the leak was in the wall of the unit next to one where 64-year-old Dale Ann Fussell’s body was found. Investigators believe fumes seeped into a crawl space before being ignited from an unknown source.

Four other people were taken to the hospital.

The blast flattened the building, awakened neighbors and scattered debris as far as a quarter mile away.