FORT PIERRE, S.D. (AP) — The South Dakota State Fire Marshal’s Office is investigating a house explosion that killed two people.

The house near the town of Fort Pierre exploded around 10:20 a.m. Wednesday, KELO-TV reported. Names and ages of the victims have not been released. A man and two children also were hospitalized. Their conditions were not released.

Stanley County Sheriff Brad Rathbun said neighbors in the rural area heard the blast and alerted authorities. The cause of the explosion is under investigation.

There has been a GoFundMe put together for the family.