Alec Baldwin accidentally shot and killed “Rust” movie cinematographer Halyna Hutchins and wounded director Joel Souza, but it’s too soon to determine whether charges will be filed, according to Santa Fe County Sheriff Adan Mendoza.

In a press conference on Wednesday, investigators confirmed the gun Baldwin was handed on set fired a single live round.

District Attorney Mary Carmack-Altwies said investigators cannot say yet whether it was negligence or by whom. She called it a complex case that will require more research and analysis.

“It will take many more facts, corroborated facts, before we can get to that criminal negligence standard,” Carmack-Altwies said.

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Fox News’ Tyler McCarthy and The Associated Press contributed to this report.