More than forty female inmates from York County Prison are being treated for carbon monoxide poisoning.
Officials say last night there were elevated levels of carbon monoxide in the female dormitory, which houses ninety women.
Warden Mary Sabol says everyone is expected to be okay and that gas levels are returning to normal.
Emergency officials say the patients are at York and Memorial Hospitals.
Right now, investigators are still trying to determine what caused the leak.
CBS 21 News was at York County Prison last night and early this morning and will continue to bring you the latest details regarding this story.