At least three doctors were shot at Bronx Lebanon Hospital this afternoon by a gunman in a lab coat.
There were reports the assailant was a Nigerian-born doctor, who had previously worked at the hospital.
Local news outlets identified him as 45-year-old Dr Henry Bello.
Police said the gunman later shot himself.
The incident began unfolding at around 2.45pm at the medical center on Grand Concourse in the Morris Heights section of The Bronx.
According to the Police, a gunman dressed as a doctor opened fire on the 16th floor of the hospital and shot multiple people.
Police said at least four people had been shot at a New York City hospital and one gunman was dead.
A spokesman for the New York Police Department (NYPD) said “there are reports of several people shot” before adding on Twitter that “one shooter is deceased at the hospital”.
The NYPD also advised people to “avoid the area of 1650 Grand Concourse”.
Television images showed the hospital surrounded by police cars and fire trucks. Police could be seen on the roof of the building, at one point, with their guns drawn.
The local ABC affiliate television station reported that two people had been shot, but added there was no word on their condition.
The station also reported that both victims were believed to be men, and that police officers were going from floor to floor inside the hospital looking for the suspect.
The 120-year-old hospital has nearly 1,000 beds spread across multiple units. Its emergency room is among the busiest in New York City.
There has been no word from authorities if the attack was an act of terrorism.
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