45-caliber Colt revolver used on the set of the film “Rust" was not thoroughly checked before being given to actor Alec Baldwin, who fired a live lead bullet in an accidental fatal shooting last week in New Mexico, according to officials and a new court filing, writes Reuters.

New details about the incident emerged on Wednesday during a news conference by Santa Fe County Sheriff Adan Mendoza and District Attorney Mary Carmack - Altwies and in an affidavit filed by the sheriff’s department. Mendoza told reporters there was a complacent attitude toward safety on the set before last Thursday"s shooting that killed cinematographer Halyna Hutchins during a rehearsal.

Hannah Gutierrez, the crew member in charge of weapons on the set, told investigators she had checked guns there but found no “hot rounds” - apparently meaning live ammunition - before the shooting, according to the affidavit.

Dave Halls, the film’s assistant director, told investigators he “should have checked all” the rounds in the gun before handing it to Baldwin but had not done so, according to the affidavit. Authorities said previously that Baldwin was handed what he thought was a “cold”, or safe, gun by Halls, who took it from a cart used by Gutierrez.