An on-set shooting death has reignited concern about the use of prop guns like the weapon actor Alec Baldwin discharged in the killing of cinematographer Halyna Hutchins while filming a movie in New Mexico, US.

Some prop guns are non-firing facsimile weapons, but many are real guns, loaded with blank rounds instead of bullets.

While the exact type of weapon used in the shooting on the set of "Rust" remained unclear, an affidavit filed by New Mexico authorities on Friday said the...