Amherst fire officials say a malfunctioning boiler caused high carbon monoxide levels in the dining commons at Hampshire College, forcing students and staff to be evacuated on Monday afternoon.
Emergency crews responded to the college at about 4 p.m.
Hampshire College officials say four people were treated with carbon monoxide poisoning symptoms and taken to Cooley Dickinson Hospital for observation.
Amherst Fire Chief Tim Nelson says fire crews are ventilating the building to make it safe to reopen.
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