File Photo – Chesak Elementary School in Lake in the Hills | Photo: Huntley District 158

Dismissal was delayed at an elementary school in Lake in the Hills after police responded for the third time in less than a week to a report of threatening graffiti found in a restroom.

Chesak Elementary School was placed on a “hold in place and teach” lockdown Wednesday afternoon, according to school officials.

A threatening piece of graffiti was found in a student bathroom.

The message referenced the presence of a weapon on school grounds.

Common spaces and hallways were cleared and officers from the Lake in the Hills Police Department responded to the school.

Authorities said they were working to investigate if a threat to safety exists in the building.

Students remained in their classrooms learning and dismissal was delayed to 3:45 p.m.

The lockdown was lifted around 3:45 p.m. and police said it has been determined there is no threat to safety.

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“Thank you for your cooperation and patience through this process as we work to get all students home safely. Please see your email for more details regarding the investigation,” the school said in a message to parents.

Last week, Martin Elementary School, which is also on the Reed Road Campus, was placed on lockdown on both Thursday and Friday.

A threatening piece of graffiti was found in a student restroom referencing the presence of a weapon on school grounds.

Police deemed there was no threat to the school on both occasions.

It is unclear if last week’s incidents are connected to Wednesday’s incident at Chesak Elementary School.