Alec Baldwin speaks on the phone outside the Santa Fe County Sheriff's Office in New Mexico after he was questioned about a shooting on the set of the film “Rust” Thursday.

Actor Alec Baldwin publicly addressed the fatal shooting of cinematographer Halyna Hutchins for the first time Friday, calling it a “tragedy” and saying he is cooperating with the investigation.

“There are no words to convey my shock and sadness regarding the tragic accident that took the life of Halyna Hutchins, a wife, mother and deeply admired colleague of ours,” he tweeted late Friday morning, a day after he discharged a prop gun during a movie shoot in New Mexico, killing Hutchins and injuring director Joel Souza.

“I’m fully cooperating with the police investigation to address how this tragedy occurred and I am in touch with her husband, offering my support to him and his family,” he said. “My heart is broken for her husband, their son, and all who knew and loved Halyna.”

The shooting happened while Baldwin, 63, was either filming or rehearsing a scene for “Rust,” an upcoming Western based on a story written by him and Souza.

The director’s injuries were not immediately disclosed, but he has already left the hospital.

Hutchins, 42, was the director of photography for the film. Originally from Ukraine, she was considered a rising star in the industry and had recently worked on documentaries as well as the films “Archenemy,” featuring Joe Manganiello, and “Blindfire,” starring Brian Geraghty. Both movies were released last year.

The shooting left Hollywood in shock, with many people questioning how a crew member could be killed with a supposed movie prop.

“I can’t believe this could happen in this day and age... gunfire from a prop gun could kill a crew member? What a horrible tragedy,” Manganiello said in a tweet. “My heart goes out to her family.”

“We are heartbroken and devastated to learn that one of our members, sister Halyna Hutchins, died yesterday from injuries sustained on set while working as the Director of Photography on Rust in New Mexico,” the International Alliance of Theatrical Stage Employees said in a statement. “Our entire alliance mourns this unspeakable loss with Halyna’s family, friends, and the Rust crew.”

The Santa Fe County Sheriff’s Office is investigating what kind of projectile was fired and whether anyone should face charges for the shooting.