(West Harrison, Ind.) - East Central High School went on lockdown Thursday after a threat was discovered in a bathroom stall.

At about 9:45 a.m. the unspecified threat was found written on the wall of a girls bathroom stall, said Dearborn County Sheriff’s Office Chief Deputy Mike Kreinhop.

A student reported the writing to a teacher. Police were then notified.

Students were moved outside for more than two hours following the threat as bomb-sniffing dogs were called in to help search the entire school building.

Kreinhop says the investigation is ongoing. No suspects have been identified.