EFEOrlando, Florida

Six of those wounded at Orlando's Pulse nightclub, where a man armed with an assault rifle opened fire against its gay clientele, remain in critical condition, trauma surgeon Michael Cheatham said Tuesday.

At a press conference offered by more than a dozen doctors and nurses of the Orlando Health organization, which operates the Orlando Regional Medical Center where most of those wounded at Pulse were taken, Cheatham said that 27 of the wounded are still hospitalized.

Of those, six remain critical, five with a guarded prognosis and 16 in stable condition.

"No patients have succumbed to their injuries since the initial nine patients that came to us at the time of the shooting," Cheatham said.

Another of the doctors on hand, Joseph Ibrahim, described the hospital's operating rooms on the day of the mass shooting as a battlefield full of people lying around shot in the chest, abdomen, pelvis and all over the body, while nurses recalled how the wounded kept pouring into the hospital.

Ibrahim described it as "a war scene."

The trauma medical director said that in minutes they had to go from one operating room to another to care for all the patients.

Fifty people, including the shooter, Omar Seddique Mateen, a 29-year-old U.S. citizen, who was armed with an assault rifle and a pistol, died in the nightclub, while another 53 were wounded.

Angel Colon, a survivor of the attack, said the killer appeared to be enjoying himself while shooting left, right and center during what was supposed to be a fun-filled "Latin night."

"Something's wrong" when a person can enter a discotheque with weapons like that, he said.

This Sunday's nightclub tragedy was the deadliest mass shooting in the history of the United States.