Police say armorer was interviewed from set where a prop-gun fired by Alec Baldwin struck a cinematographer and director

• Police say an armorer was interviewed as a witness following after a gun discharged on the set of the film "Rust."
• The armorer has not been identified.

The Santa Fe Sheriff's Office says it interviewed an armorer from the set of "Rust," where Alec Baldwin discharged a prop-gun Thursday, killing director of photography Halyna Hutchins and injuring director Joel Souza.

"Please be advised that witnesses were interviewed who were on set including the armorer," a spokesperson for the sheriff's office told Insider. "We are not releasing their name at this point."

The International Alliance of Theatrical Stage Employees Local 44, a prop masters union, said in an email seen by Indie Wire that none of its members were on the movie's call sheet.

Hours before the shooting, half a dozen camera crew members had walked off the set at Bonanza Creek, to protest working conditions on the low-budget film, people familiar with the matter told the Los Angeles Times.

One source told the LA Times that a number of nonunion crew members replaced those that walked off.

An armorer is usually on a set to oversee all weapons used in a film, and make sure they're being used in a safe manner.