911 Call Reveals Details About Alec Baldwin's On-Set Shooting Accident: 'We Need Help Immediately'

More details are emerging about the tragic accident on the New Mexico set of Alec Baldwin's upcoming western film when he misfired a prop gun, killing the film's cinematographer and injuring the director.

In audio of a 911 call obtained by TMZ, the caller — who identified herself as the script supervisor — explained that the crew had been rehearsing a scene when the gun discharged.

"We have two people accidentally shot on a movie set by a prop gun," she told the operator. "We need help immediately."

She added that, after the gun misfired, "we all ran out."

Mark Sagliocco/Getty Images; Mat Hayward/Getty Images; Ron Adar/SOPA Images/Shutterstock Alec Baldwin; Halyna Hutchins; Joel Souza

Asked if the gun was loaded with a real bullet, the script supervisor said she didn't know. She said that Hutchins and Souza were "doubled over" when she last saw them, but she did not have any information about the extent of their injuries.

Soon after, another person took over the call. He told the operator that Hutchins and Souza were "alert" following the shooting and that a set medic was assessing them, the audio reveals.

Jim Spellman/Getty; Fred Hayes/Getty

RELATED: Rust Set Didn't Have a Union Prop Master Working on Day of Alec Baldwin Incident, Says Union

Authorities responded to the incident around 1:50 p.m. local time following 911 calls indicating "an individual had been shot on set," the Santa Fe Sheriff's Department wrote in a press release obtained by PEOPLE.

Upon further investigation, the sheriff's department learned that Hutchins, 42, and Souza, 48, were "shot when a prop firearm was discharged" by Baldwin, 63.

Hutchins was airlifted to the University of New Mexico Hospital, where she died from her injuries, according to the sheriff's department.

Never miss a story — sign up for PEOPLE's free weekly newsletter to get the biggest news of the week delivered to your inbox every Friday.

Souza was undergoing treatment for his injuries at Christus St. Vincent's hospital on Thursday night, officials said. On Friday, his reps confirmed to Deadline that he had been released.

Following Hutchins' death, directors, actors and those in the film industry paid tribute to the late cinematographer.

"She was an absolutely incredible talent and a great person. She had such an eye and a visual style, she was the kind of cinematographer that you wanted to see succeed because you wanted to see what she could pull off next," wrote actor Joe Manganiello on Instagram, "and she was a fantastic person."

Halyna Hutchins/ instagram Halyna Hutchins on the set of 'Rust'

So far, no charges have been filed. The investigation into the incident remains ongoing.

The film set has now been shut down, with production indefinitely paused, according to the film's production company, Rust Movie Productions LLC.

RELATED: Alec Baldwin's Rust Fatal Shooting Prompts Petition to End Use of Real Guns on Sets

"The entire cast and crew has been absolutely devastated by today's tragedy, and we send our deepest condolences to Halyna's family and loved ones," Rust Movie Productions LLC said in a statement. "We have halted production on the film for an undetermined period of time and are fully cooperating with the Santa Fe Police Department's investigation. We will be providing counseling services to everyone connected to the film as we work to process this awful event."