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March 11 (UPI) — Three employees at a post office in upstate New York were sickened after coming in contact with a package that contained an unknown hazardous substance, according to a fire official.

Albany County Sheriff Craig Apple said the incident occurred early Sunday morning at a U.S. Post Office processing and distribution facility in Colonie, N.Y., near Albany.

The workers all contracted a rash and other symptoms after separately entering the package room.
They were not hospitalized but needed medical care, officials said.

The first employee went to an urgent care facility. Emergency personnel were called after a second person became ill, shortly after midnight, according to WTEN-TV.

Local fire departments and several hazmat and decontamination crews were then summoned. And employees at the facility were put in quarantine.

The building is closed Sunday while crews clean it.

Officials said they haven’t definitely concluded where the undetermined hazardous substance came from.