Students at Tolland High School were dismissed from school early after multiple staff members became ill Friday morning.
Emergency officials were called to the school around 9:30 a.m. after five cafeteria workers became ill with flu-like symptoms.
The workers were taken to an area hospital as a precaution.
The school was immediately evacuated and students were bused to nearby Tolland Middle School while officials investigated the incident.
Around 11:30 a.m., the decision was made to dismiss students early.
School was canceled for the day because fire crews believe the cafeteria workers got ill from a carbon monoxide leak that caused CO poisoning.
The leak may have started with the HVAC system.
"Those systems could be out of whack, however we're not positive about that at this point in time," said Tolland County Deputy Fire Chief Doug Racicot.
The students were only allowed to return to the building to get their belongings.
"Because five cafeteria workers were sent to the hospital, they didn't have staff to put on lunch today," Racicot said. "In addition, the cause and origin of the carbon monoxide problem is still being investigated."
According to the fire officials, Tolland students have next week off that gives the district a good chunk of time to make sure all the ventilation and other systems are working properly.
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