According to officials in a recent court filing, a .45-caliber Colt revolver used on the set of the film "Rust" was not adequately vetted before being delivered to actor Alec Baldwin, who discharged a live lead bullet in an accidental deadly shooting last week in New Mexico.

New information concerning the event was released on Wednesday during a news conference held by Santa Fe County Sheriff Adan Mendoza and District Attorney Mary Carmack-Altwies, as well as in an affidavit filed by the sheriff's office.

Mendoza told reporters that there was a lack of concern for safety on the set before last Thursday's shooting, which killed cinematographer Halyna Hutchins during a rehearsal.

According to the complaint, Hannah Gutierrez, the crew member in charge of weapons on the site, told investigators she examined pistols but found no "hot rounds" - probably suggesting live ammo - before the incident.

The gun was delivered to Baldwin by Dave Halls, the film's assistant director, who told him it was "cold" or safe.

"He advised he should have checked all of them, but didn't," Halls told police, according to the affidavit. Halls was referring to the barrels of the revolver.

Halls was sacked from a prior film set in 2019 due to a firearms incident, according to production firm Rocket Soul on Monday. He has not made any public statements on the event.

Mendoza and Carmack-Altwies noted that while no criminal charges have been brought, they are not ruling it out.

Carmack-Altwies said of the charges that all the options are on the table and no possibilities can be ruled out till now.

According to the legal experts, Baldwin might not face any criminal accusations, even if criminal charges are filed.

The shooting sent shockwaves through Hollywood, sparking a debate about film and television safety regulations, including whether specific types of firearms used as props should be outlawed, as well as working conditions on low-budget movies.