A gunman who opened fire at Bronx-Lebanon Hospital Center is dead, police said.

A law enforcement official told the Associated Press that the gunman killed at least one person before killing himself.

The gunman was wielding a rifle and killed a woman, authorities said. Six others were hit, five of them receiving serious wounds, according to authorities.

The extent of the injuries of the other shooting victims wasn’t immediately clear. A witness told CBS2’s Valerie Castro one of the victims was a doctor who had been shot in the hand. Another was struck in the leg.

The gunman has been identified as Dr. Henry Bello, a former employee. He allegedly brought a rifle into the hospital underneath a white lab coat.

Bello was fired from the hospital two years ago for harassing an employee, sources said. He searched for an employee before opening fire, according to sources.

Dr. Henry Bello

The gunman opened fire on the 16th and 17th floors at around 2:55 p.m., Police Commissioner James O’Neill said.

The hospital’s fire alarm system went off during the incident after Bello apparently tried to set himself on fire.Responding officers went floor by floor searching for Bello.

“Everybody said ‘Code red, shut your doors.’ We didn’t know what was going on, we were scared. I heard people screaming. … I pushed the chair to the door so nobody could come in,” a hospital patient named Toby told CBS2’s Valerie Castro. “I got scared. I started crying, I didn’t know what to do.”

Images posted on social media showed some of the impromptu barriers against the doors.

What do you do when you hospital has shooter in it

A post shared by @herrydrk on

“People were scared, they were nervous,” Toby added. “I feel very grateful, I’m scared to go back inside.”

One of the gunshot victims was a doctor who had been shot in the hand, witness Gonzalo Carazo said.

“It was scary seeing the blood on the doctors,” Carazo said. “I saw blood on the floor, I saw blood on one of the doctor’s hands.”

“When I heard that my heart started beating and I prayed. I called my pastor to pray for us,” a woman named Hilda said. “I told everybody to pray because we didn’t know what would happen to us. … We locked the door and everybody laid down on the floor. I’m sickened.”

“I think about ten people [were in the room].We locked the door and everybody laid down on the floor. I feel so bad because I’m shaking,” Mensa said.

“We heard ‘active shooter, active shooter,'” ambulance worker Robert Maldonado said. Maldonado was on the ninth floor, and said police carried a victim down from the 12th floor. Maldonado, his partner and police officers then carried the shooting victim down nine flights of stairs to the ground floor, he told Castro.

Mayor Bill de Blasio and Police Commissioner James O’Neill both went to the scene after the shooting.

“Even in the midst of this horror, there were many, many acts of heroism,” de Blasio said, praising the emergency responders. “They put the safety of New Yorkers first, as they always do.”Bronx-Lebanon Hospital Center describes itself as the largest voluntary, not-for-profit health care system in the south and central Bronx.

The 120-year-old hospital claims nearly 1,000 beds spread across multiple units. Its emergency room is among the busiest in New York City.

The hospital is about a mile and a half north of Yankee Stadium.