'Rust' production said they would use simulated gunfire and blank rounds, according to film permit

• The production company for "Rust" received a permit to film with simulated gunfire, blank rounds.
• The company also said it had a $1 million personal and adverse injury policy in the film's permit.
• On Tuesday, the Santa Fe County DA said an investigation could result in criminal charges.

The production company for "Rust" told local authorities it planned to shoot the movie with simulated gunfire and blank rounds, documents obtained by Insider show.

Alec Baldwin discharged one of the movie's prop guns on set Thursday, killing cinematographer Halyna Hutchins and injuring director Joel Souza. David Halls, the movie's assistant director, yelled "cold gun" before handing it to Baldwin while rehearsing a scene, indicating the firearm was safe to use, according to an affidavit for a search warrant filed by the Santa Fe Sheriff's office.

Rust Movie Productions LLC, the limited liability company created to film the movie, obtained permits for the movie's production. One permit issued by the Santa Fe Film Office on September 21 and reviewed by Insider says the filming would include "Simulated gunfire, blank rounds, squib hits," referring to packets of fake blood.

The permit also says that "extraordinary noise will occur" at over 55 decibels.

Last Friday, the International Alliance of Theatrical Stage Employees (IATSE) Local 44, a union representing prop masters, told its members the gun discharged by Baldwin contained a "live round," calling the incident an "accidental weapons discharge."

Hollywood filmmakers and actors also called for a ban on firearm blanks after the tragic incident.

On Tuesday, Santa Fe County District Attorney Mary Carmack-Altwies told The New York Times that "everything at this point, including criminal charges, is on the table."

Carmack-Altwies said an investigation is underway, focused on both what kind of projectile was loaded into the gun that killed Hutchins, as well as who loaded the gun. According to The Times, investigators have so far recovered nine spent casings, three black revolvers and loose ammo from the scene.

"There were an enormous amount of bullets on this set, and we need to find out what kinds they were," Carmack-Altwies said.

The production company also filed a certificate of liability insurance with local authorities, indicating it had a $1 million personal and adverse injury policy, as well as $10,000 for medical expenses for individuals.