The West Virginia Department of Corrections said in a statement that one inmate possessed a possible controlled substance.

BARBOURSVILLE, W.Va. (AP) — Authorities are investigating after three inmates at a West Virginia jail overdosed on unknown drugs, officials said.

The inmates at Western Regional Jail were treated at a hospital Saturday and returned to the facility, news outlets reported. No charges had been filed as of Monday,

The state Department of Corrections said in a statement that one inmate possessed a possible controlled substance. An investigation into the incident is continuing.

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