The supplier is accused of donating crates of ammunition that were advertised as carrying solely inert dummy bullets but actually contained live shots, according to the lawsuit.

On Wednesday, the armorer in charge of weapons management for the film “Rust” in New Mexico, where Alec Baldwin fatally shot a cinematographer last year, filed a lawsuit accusing a gun and ammo supplier of bringing “hazardous” materials onto the set.

The armorer, Hannah Gutierrez-Reed, said in the lawsuit that Seth Kenney and his company, PDQ Arm & Prop, provided the package — labeled “dummy” rounds — that included at least one live round that discharged from a gun that Baldwin was training with on Oct. 21 of last year.
Halyna Hutchins, the cinematographer, was killed in the explosion, while Joel Souza, the film’s director, was injured.