Superintendent of the Fleetwood Area School District Greg M. Miller announced the closing on Twitter.
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There was a large police response at the Fleetwood Area Middle School as members of a community theater group began getting sick around 8:30 p.m. Thursday while practicing for a play in the auditorium.
At the time, authorities weren't sure what caused the illness that ultimately sent a dozen people to the hospital.
But early Friday morning, Miller confirmed the cause was carbon monoxide.
"FWASD Middle School will be closed today due to a carbon monoxide problem last evening. All other buildings will be operating on a regular schedule. Phone call notifications will be going out at 5:30 am. More information will be released later today," Miller tweeted.
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People in other parts of the building besides the auditorium did not become ill, officials said.
8 people sickened at Berks County middle school
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