Okawville police were investigating a threat made against the Okawville Junior/Senior High School on social media Wednesday night.
Principal Keith Senior sent out a robocall to parents Wednesday night, informing them of the threat. The message did not specify what the threat was, or whether it was considered credible.
"We are working with authorities to take measures to ensure the safety of our students," Senior said. "Please take time this evening to have a conversation with your child in regards to this matter."
No further information was immediately available.
Police would not comment on the investigation Wednesday night.