A gunman has opened fire inside a hospital in the Bronx borough of New York.
The man, said to be dressed as a doctor, began shooting at the 1,000-bed Bronx-Lebanon Hospital in the Morris Heights district, reports say.
At least three people are believed to have been shot, although other reports speak of multiple casualties.
A spokesman for the police said that one gunman had now been found dead at the scene.
Messages on social media spoke of doctors and nurses barricading themselves inside the building.
There are also some reports of a fire in the building.