The NYPD is responding to reports of multiple people shot inside Bronx-Lebanon Hospital at 1650 Grand Concourse, a police spokesman said. There are no confirmed fatalities at this time. [See below for updates: an NYPD spokesman says one shooter has died, one victim has died and six victims are injured.]

"At this time it is being investigated," a spokesman for the NYPD said. "Multiple people got shot and we are looking for the perp at this time."

The NYPD and FDNY responded to the hospital shortly before 3:00 p.m. An FDNY official told the NY Times that three doctors have been shot, but an FDNY spokesperson would not confirm that report. The Times also reports that the shooter is a tall, thin man wearing a lab coat, citing an NYPD radio transmission.

“It looks like [the shooter is] an employee of the hospital, that’s what we’re hearing, unconfirmed, right now,” the FDNY official told the Times.

One Instagram post appears to show people barricaded inside the hospital.

Nice start of the weekend.

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This is a developing story. Check back for updates.

[Update 3:57 p.m.]: An NYPD spokesman tweeted that one shooter is dead at the hospital. There have been no reports of multiple shooters.

[Update 4:30 p.m.]: Multiple news outlets have identified the shooter as one Henry Bello, a former doctor at the hospital, who is listed on the hospital website as a family physician.

Bello allegedly hid his weapon under a lab coat, the Associated Press reports.

[Update 5:56 p.m.] Mayor de Blasio held a press conference in front of the hospital following the shooting. He began by stating, "We've had a real tragedy here in the Bronx this afternoon. It's something we've seen around the country and now we've experienced here."

He went on to call the shooting a workplace-related matter, and confirmed that one doctor is dead, telling the assembled press "our hearts go out to the family of the doctor who passed away." De Blasio added other doctors were "fighting for their lives."

The mayor also thanked police and firefighters for their "exceptional" work responding to the shooting, and the doctors, nurses and hospital personnel who "responded with incredible bravery" and still protected their patients "even in the midst of this horrible situation."

The mayor also urged patience, saying "there will be an opportunity in the coming hours to provide more detailed information, but at this point there is a lot we are piecing together."

NYPD Commissioner James O'Neill also addressed reporters, but did not take questions. The commissioner said that the first call of the shooting came in at 2:55 p.m. and that patrol units from the 44th and 46th precincts determined that several people had been shot on the 16th and 17th floors by a shooter with an assault rifle.

O'Neill also said that "the hospital's fire alarm went off due to suspect's attempt to set himself on fire," and that the man was found dead on the 17th floor of the hospital with a self-inflicted gunshot wound. Police also found a dead female victim on the 17th floor.

Officers found six additional victims with serious injuries on the hospital's 16th floor; one with a gunshot wound to the leg and five others in serious condition.

O'Neill wouldn't confirm the name of the shooter, but did confirm that he was a former hospital employee.

"The situation was very scary and we all panicked," Dr. Pranav Sharma told DNAinfo. "We all locked ourselves in the doctors duty room. Initially I did not think they were gunshots. But I knew when a lady was rushing to our room and said there was a shooting — then I knew. She was running for her life."

Additional reporting by David Colon