A woman said to have been in a vegetative state for at least a decade at a private health facility in the US is reported to have recently given birth, sparking a police investigation.
The woman gave birth on December 29 at a Hacienda HealthCare in Phoenix where staff were unaware she was pregnant.
It is understood the woman, who has not been identified, was the victim of a near-drowning more than 10 years ago. Reports said she was heard to be moaning and the baby's head was starting to emerge when a nurse came in. It is believed the baby is in good health.
"None of the staff were aware that she was pregnant until she was pretty much giving birth," a source was quoted as saying.
Following the initial reports, Hacienda HealthCare and state officials issued brief statements expressing concern and describing reviews being conducted and steps being taken.
But they did not specifically confirm the reported pregnancy and birth.
Phoenix Police Department spokesman Sergeant Tommy Thompson said only that the "matter is under investigation".
He declined to confirm whether the investigation involved a possible sex crime.
Hacienda said it is co-operating with police and reviewing its security protocols after becoming aware of a "deeply disturbing" incident and "an unprecedented matter".
It added: "While federal and state privacy laws prohibit us from publicly discussing a patient's health or case, Hacienda has and will continue to co-operate fully with law enforcement and all the relevant regulatory agencies regarding this matter."
Governor Doug Ducey's office said he was briefed on the "deeply troubling" reports and that state agencies "immediately began taking every measure to protect patient safety".
According to the Arizona Department of Health Services, the 60-bed Hacienda facility was required to tighten security procedures to protect patients in the wake of the reports.
"We are aware of this situation and are actively working with local law enforcement in their criminal investigation," the department said in a statement.
The state's Department of Economic Security, a social service agency, said it performed health and safety checks on all residents at the Hacienda facility after the birth was reported and is working with the police investigation.