Officials say an alarm went off around 1:30 p.m. and all students and staff evacuated the building.
Langhorne, Pa. school evacuated after rise in CO levels
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Some students complained of symptoms, the superintendent said, but did not require a trip to the hospital.
According to the superintendent, there was some sort of incident in the kitchen that caused the high levels of carbon monoxide.
The exact cause remains under investigation.
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