- Exeter Hospital in New Hampshire was evacuated Friday morning and extra ambulances were called in after reports of an odor in the emergency room, according to the local firefighters' union.
Exeter Hospital where at least 20 patients were injured following a "chemical release".
Aerial images show several hospital beds with patients in a roped off area outside the hospital.
A cause had yet to be determined, she said.
Epping Fire said it was dispatched for a "carbon monoxide problem".
The incident began at about 09:00 (13:00 GMT) when four employees began complaining of headaches, dizziness and nausea, according to Dr Neil Meehan, the hospital's chief physician assistant. At this time, the cause is unknown. They say all of the Exeter Fire Department's units and multiple other units from nearby towns are operating at the hospital. Twelve of those who felt ill were sent to other facilities and seven were released, Vasapolli said. No patients experienced any symptoms. Officials also chose to close the Emergency Department as well.
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