Six adults and one student were transported to a Boston hospital as a precaution Monday morning after a battery charger overheated and released a vapor into the air at the Manville School, fire officials said.
"There is no expectation that anyone will be admitted," fire department spokesman Steven MacDonald said. "It's just to get checked out."
A second student chose not to ride in an ambulance, but also went to the hospital for further testing after talking with emergency responders.
MacDonald said firefighters were called to the school around 9:30 a.m. when students and adults reported feelings of nausea after trying to cool down an external battery charger that had overheated and sparked. Maintenance workers brought the electronic to a restroom and doused it in water, where it emitted a vapor, causing the symptoms.