Mt. Vernon High School was evacuated Tuesday after a bomb threat was found by administrators.

According to a statement from the school’s website, a bomb threat was written on a bathroom stall around 3:30 pm. Those that were still in the building were immediately evacuated.

Law enforcement was brought in, and the buildings were scoured by local authorities, the Secretary of State Police, and a bomb-sniffing canine unit.

After the school was fully swept, the all clear was given.