SHOTS were fired at Westchester Medical Center in New York State, police said.
Officials confirmed it was an active scene, but didn't provide further details.
A source told news station CBS2 the situation is under control and there is no immediate threat to the public.
A call about the shooting at the hospital Valhalla, Westchester, came in shortly after 9.30am (local time) this morning. The New York Daily News reports the gunman has shot himself.
“Sometimes family members get a little outraged,” Clarence McMillan, a hospital worker, told The Journal News.
“They don't understand the care and stuff we have to go through to help their loved ones survive. Maybe this is one of those situations.”
The incident is the second hospital shooting in New York just over a year.
In June 2017, a doctor walked into the Bronx-Lebanon hospital and opened fire with an AR-15 rifle. He killed a doctor and wounded five members of staff and a patient before killing himself.