A student’s note on a restroom wall referencing a shooting to come Friday at Pekin Community High School prompted police to assign extra officers to the school, though the threat is considered “non-credible.”

The incident is taken “with the utmost seriousness” by the school, according to a school statement issued Thursday. However, it’s expected to produce no more than discipline issued “swiftly and sternly” to the student considered responsible.

It was the second time this month that police have added extra officers to the school campus in the wake of a perceived threat. On Nov. 2, concerns originated from “a student listening to a song referencing shootings at school,” the school stated.

No classes were cancelled then, and the school’s Friday classes began as scheduled.

School administrators said a graffiti message was left Thursday on a restroom wall at the high school referencing a school shooting on Friday. A second student reportedly posted a photo of the message on social media before informing school officials.