CONCORD, N.C. -- Emergency officials were dispatched to a local congressman's office Tuesday morning in reference to a piece of mail received that contained a white powder substance.

Concord Police and Fire were dispatched to Congressman Richard Hudson's office in the 300 block of McGill Avenue NW in Concord at 10 a.m. Tuesday.

Authorities say a staff member opened a piece of mail that contained a white powder substance.

First responders determined the substance was not immediately hazardous , and cleared the scene.

Congressman Hudson, who represents North Carolina's Eighth District, was not in the office at the time.

The Concord Police Department is investigating to determine the source of the letter.

Authorities say the mailing also contained a writing, but are not releasing the contents of the text included.

U.S. Capitol Police are assisting in the investigation.

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