BUCYRUS, Kan. (AP) — Authorities say two bodies found in the remnants of a burned house in rural Miami County in Kansas had been shot.

The Kansas City Star reports that the sheriff’s office made the announcement Thursday. The identities of the victims haven’t been confirmed.

Their bodies were discovered Monday after firefighters extinguished a blaze that destroyed the house and a barn. Firefighters reported that ammunition was exploding inside both structures.

Preliminary autopsy reports received Wednesday indicated that both victims died from gunshots. The cause of the fire is under investigation.