(CBS Detroit) — Police say an investigation into a potential threat caused the Plymouth-Canton Educational Park to be on lockdown on Thursday.

According to the Canton Township Police Department, school dismissal was delayed until the investigation is complete. No injuries have been reported.

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An update from Plymouth-Canton Community Schools says the administration is preparing a supervised release of students coordinated with law enforcement. The release will go building by building.

“Upon exiting the building, all students who utilize transportation will board their regularly-assigned buses or use their previously planned means of traveling home. Please be patient as we safely work to get students and staff released from the P-CEP campus,” read the update.

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All after-school activities and athletics are canceled Thursday.

Canton Township police, as well as Plymouth and Plymouth Township police departments, are on the scene.

The Plymouth-Canton Educational Park consists of Canton High School, Plymouth High School and Salem High School.

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