YORKTOWN, Va. (WVEC) -- Police are investigating after a potential threat was found in a school restroom at Tabb High School.

The York-Poquoson Sheriff's Office did not say what the threat said, but that it was written as graffiti in a school bathroom.

The Sheriff's Office and school administrators worked together and found no evidence that suggested the graffiti to be a credible threat.

As a precautionary measure, addition deputies will be at the school throughout the day Friday.