DARLINGTON, Pa. (AP) — Authorities say two people are unaccounted for after an early morning house explosion in a rural area of western Pennsylvania.

Emergency dispatchers in Beaver County say the blast at the South Beaver Township residence was reported at about 4 a.m. Tuesday. South Beaver Township is about 40 miles northwest of Pittsburgh.

Officials say fire crews were told to keep their distance because ammunition inside the residence was going off. Police said some debris flew a quarter of a mile away from the home.

There was no immediate information about the cause of the blast or the identities of the two people reported missing.

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