The shooting began at about 14:45 local time (18:45 GMT) at the 1,000-bed Bronx-Lebanon Hospital.
There are reports of a shooting incident inside a hospital in the Bronx borough of NY.
A gunman opened fire at a hospital in New York City Friday afternoon, shooting multiple people including at least three doctors, according to the New York Times. More information will be posted as it becomes available. By 3:30 the section of the hospital where the injured doctors were contained had been secured and the police were leading a heavily armored group of emergency service workers into the building. Police sources said the shooter is a 35-year-old ex-employee using an M-16 type rifle.
The 120-year-old hospital has almost 1,000 beds and one of the busiest emergency rooms in New York City.
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CBS New York reporter Reena Roy tweeted that the NYPD has confirmed that the shooter is down and no longer a threat.
Police went floor by floor searching for the shooter while the hospital has been surrounded by emergency response vehicles.
Police said multiple people were shot, though the extent of their injuries was not immediately known.