Actor Alec Baldwin reportedly fired a prop gun on a movie set in New Mexico on Thursday, accidentally killing a cinematographer and injuring the director.

The prop gun was fired by Baldwin at Bonanza Creek Ranch, where the filming of “Rust” was underway, according to the Santa Fe County Sheriff’s Office. The set was locked down as police investigate the tragic accident.

“The sheriff’s office confirms that two individuals were shot on the set of Rust. Halyna Hutchins, 42, director of photography and Joel Souza, 48, director, were shot when a prop firearm was discharged by Alec Baldwin, 68, producer and actor.” the statement said. “

Ms. Hutchins was transported, via helicopter, to University of New Mexico Hospital where she was pronounced dead by medical personnel. Mr. Souza was transported by ambulance to Christus St. Vincent Regional Medical center where he is undergoing treatment for his injuries.”