Administrators say that note was found in a school bathroom on Wednesday morning.
Chopper 6 video: Souderton High School evacuation
As a precaution, all students and staff were evacuated to the stadium while the building was searched.
However, due to the low temperatures, officials decided to dismiss the school beginning at 9:45 a.m.
Buses will be departing from the school.
Parents who wish to pick up their children are asked to do so at the Halteman side of the building.
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