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PLUM, Pa. —Four people are dead and one is still unaccounted for after a house explosion in Plum, local emergency officials said Saturday night.

The names of the people who died have not yet been released. The cause of the blast remains under investigation.

"All activity involving this tragedy has been suspended for the evening due to the weather and the darkness and the safety of those all involved," Plum police Detective James Little said. The Allegheny County Fire Marshal's Office will return to the scene Sunday morning.

Three houses were destroyed and at least a dozen more were damaged by the explosion, which was reported at about 10:23 a.m. on Rustic Ridge Drive at Brookside Drive, Allegheny County spokesperson Amie Downs said.