TAOS, N.M.—Some of the people who handled guns on the set of Alec Baldwin’s movie “Rust” may face criminal charges in the fatal shooting of a cinematographer, the New Mexico district attorney said on Friday. Mary Carmack-Altwies said in a statement that she had not made any decision yet on charges but that everyone involved “in the handling and use of firearms on the set had a duty to behave in a manner such that the safety of others was protected.” Once the investigation is complete “certain individuals may be criminally culpable for his/her actions and/or inactions on the set of ‘Rust’,” she added. Carmack-Altwies gave no indication when the investigation might conclude. Her statement followed a television interview on Thursday by Baldwin, who was holding the gun when it fired a live bullet and killed cinematographer Halyna Hutchins and wounded director Joel Souza during a rehearsal in October on …