WHEATON, Md. (WUSA9) -- Officials in Maryland have concluded an investigation on an unknown 'white powder' incident which happened at a Police station.

On May 28, a woman received an envelope in the mail which contained an 'unknown white powder'. She then took the envelope to a Police station. Due to this incident, the station was evacuated immediately, officials said.

To avoid further exposure, the woman who brought the envelope was being kept separate from anyone who may have been exposed, officials said.

Due to the incident at 2300 Randolph Road, the road was closed in both directions in front of the station. All roads are now open.

The Montgomery County Fire Department's Hazardous Material Unit investigated the incident and said the white powder is non-hazardous.

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