UPDATE: Some school staff members read some remarks in an online forum— some remarks which they perceived to be threatening toward a member of the school staff, according to police spokesperson Lucy Caldwell. 

"Together, a decision was made to secure the school, based on the nature of these comments," Caldwell said in an email to Patch. "Police investigated further and determined that there was no criminal offense. No charges have been placed."

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Carl Sandburg Middle School was placed under heightened security Wednesday after the principal received indirect threats.

The Fairfax County Public Schools Office of Safety and Security notified principal Terrence Yarborough at approximately 8 a.m. Thursday that there were indirect threats being made towards him, according to an email sent to parents and guardians. The school immediately took security precautions; no classes were held outside and adults and school security monitored all exits. The doors were secured as part of the school's daily security plan.

The email stressed that at no point were students in any danger. The situation is being monitored by school officials and Fairfax County Police.