The shooting of the man in his 20s, who was hit in the chest, was believed to have been accidental but police said they had opened a criminal investigation.
"A scene was being conducted in which the actors were using... A number of firearms," Detective Inspector Tom Armitt told reporters.
"The deceased person was an actor in that scene.
"The film crew were actively performing CPR (cardiopulmonary resuscitation) on the person," Armitt said, adding that the man died at the scene.
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