Emergency services are responding to reports a person has been shot at Nepean Hospital in Sydney's west.
NSW Police told AAP they are responding to an incident at the hospital while NSW Ambulance said there were reports one person has been shot.
They are five ambulance crews on the scene with one patient being treated, an ambulance spokesman said on Thursday afternoon.
The first call for help came in about 4pm.
A police officer almost lost his life in early 2016 after being shot twice in the leg while struggling with a drug-affected patient at the same hospital.
Sergeant Luke Warburton was the first officer to arrive at Nepean's emergency ward more than two years ago after a 39-year-old man allegedly held a pair of scissors to the throat of a female doctor.
