A bomb threat brought police to Philipsburg-Osceola Area High School on Tuesday.
According to state police at Philipsburg, the threat was found written on a bathroom wall at the school at about 12:15 p.m.
The threat said there was a bomb under the school, said Superintendent Gregg Paladina.
Bomb detecting dogs were brought in from both the state police and Penn State police to search the grounds. The auditorium was cleared first, and students moved there in light of inclement weather while the remaining building was searched.
No bomb was found, said police, who are treating the incident as a terroristic threat. Paladina said the threat was never believed to be credible but had to be investigated as though it were.
Its always better to err on the side of student safety, he said.
Investigations are being conducted by both the state police and school administration, including pulling surveillance video from the hallways.