According to Johnston County Public Schools, a small gas leak was found in a separate building near Choice Plus Academy.
"We were notified that some kids expressed mild symptoms of headaches or nausea," said Johnston County District Spokesperson Richard Carr.
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19 people were assessed at the scene and eight were taken to UNC Health Johnston. Five of them are students and three are faculty.
Classes at the school were closed out of an abundance of caution, the school district said.
"Local law enforcement, local emergency officials, and local school officials have determined that we need to dismiss our choice bus academy," Carr said.
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Carr said classes are expected to resume Thursday morning.
Piedmont Natural Gas tells ABC11 they found a leak in the boiler room of a separate building and fixed it.
They also sent us this statement about the incident:
"Piedmont Natural Gas technicians responded to Choice Plus Academy in Smithfield, N.C. on Oct. 4. Piedmont worked with the local fire department and the customer to investigate the incident and did not find a gas leak or any CO reading in the main building of the school. A natural gas leak was discovered in a separate building, inside the school's boiler room, on the customer's fuel pipe. Piedmont technicians isolated this leak while onsite."