Galt Collegiate Institute in Cambridge was briefly placed under a hold and secure on Thursday morning, according to the Waterloo Region District School Board.
On Twitter, the board announced the hold and secure at 11:12 a.m. but 15 minutes later, the board announced that it had been lifted.
A spokesperson for the Waterloo Regional Police told Global News that officers are conducting an investigation in the area.
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They said more information will be provided in the future.
This story will be updated as more details become available.
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