WILSONVILLE, OR (KPTV) - A women's prison in Wilsonville was placed in lockdown after an unknown substance was found in the mailroom Wednesday morning.

Tualatin Valley Fire & Rescue said at around 9:30 a.m. an employee in the mailroom at Coffee Creek Correctional Facility opened an envelope with a white powdery substance inside and some of the powder got on one person.

All four workers who were in the mailroom will go through a decontamination process and will be taken to an area hospital for evaluation as a precaution, according to TVF&R.

TVF&R said no serious symptoms, but one or two people reported some mild irritation.

The mailroom and the surrounding building were evacuated.

FOX 12 learned the mailroom is in the same building as the administration officers for the prison superintendent, assistant superintendent, and IT departments. It's also the main entrance building where visitors go through security.

Coffee Creek was placed in lockdown, meaning nobody is allowed to come in or go out. Mail deliveries are being turned away.

The substance found in the envelope has not been identified.

The investigation is ongoing.

Copyright 2019 KPTV-KPDX Broadcasting Corporation. All rights reserved.

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