EPPING, N.H. (WHDH) - A hospital in New Hampshire was evacuated Thursday afternoon after several people inside fell ill, officials said.

Everyone who was inside the Epping Regional Health Center was ordered out of the building.

Officials say 10 people, all employees at the center, exhibited symptoms of carbon monoxide exposure, but they were unable to find any contaminants in the air.

Several people were treated at the scene for unknown sicknesses, according to the Epping Police Department.

The cause of the incident is under investigation.

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