Shots were fired inside New York City's Bronx Lebanon hospital on Friday, police said, and local media reported that three doctors were wounded, while a gunman remained inside the building.
Few other details were immediately available about the incident.
The New York Times, citing information furnished by the city Fire Department, reported that three physicians had been shot, and that at least one of the wounded doctors was being treated by people inside the hospital who fashioned a tourniquet from an emergency fire hose.
CBS News reported that the gunman, believed to be a former hospital employee, had a rifle and had barricaded himself inside the building.
The local ABC affiliate reported that two people had been shot, but added there was no word on their condition.
The ABC affiliate said both victims were believed to be men, and that police officers were going from floor to floor inside the hospital looking for the suspect.
On Twitter, the New York Police Department told members of the public to avoid the area around the hospital, located in the borough of the Bronx at 1650 Grand Concourse.
An official who answered the phone at the hospital said she had no immediate information.
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