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A gunman opened fire inside the emergency room of a Manhattan hospital Thursday night, sources said.

Gunman opens fire inside NYC hospital, barricades himself inside

The 65-year-old fired 5 or 6 shots inside Memorial Sloan Kettering Hospital, before barricading himself in the hospital bathroom around 8:45 p.m. law enforcement sources said.

He remained entrenched at 10:30 p.m.

The NYPD said its hostage negotiating units and emergency services were on the scene.

No injuries were immediately reported, police said.

NYPD Precinct 19 urged the public to avoid the area.

“There is an active police investigation into Sloan Kettering Hospital located at 425 E 67 Street,” the precinct tweeted.

“Avoid the area and expect a large police presence.”