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Investigators emphasized how complicated the investigation into the "Rust" movie set shooting actually is during a press conference Wednesday.

District Attorney Mary Carmack-Altwies revealed there is no precedent for this kind of case in her district.

"It is a very complex case," she told reporters.

Three people all handled the gun that Alec Baldwin later fired, fatally shooting cinematographer Halyna Hutchins, according to a third search warrant executed by the Santa Fe Sheriff's Department.

ALEC BALDWIN ‘RUST’ SHOOTING: ‘TOO EARLY’ TO COMMENT ON CHARGES, INVESTIGATORS

Santa Fe County Sheriff Adan Mendoza speaks to reporters about investigators' initial findings Wednesday in the fatal movie-set shooting in which Alec Baldwin fired a gun used on set, killing a cinematographer and wounding the director.

Santa Fe County Sheriff Adan Mendoza speaks to reporters about investigators' initial findings Wednesday in the fatal movie-set shooting in which Alec Baldwin fired a gun used on set, killing a cinematographer and wounding the director. (Lauryn Overhultz for Fox News)

"The reality is, it's very complicated, from an evidentiary standpoint and a forensics standpoint, it is a very complicated case," Santa Fe County Sheriff's public information officer Juan Rios told Fox News after the conference. "It really is. It would be complicated for any agency."

"The number of witnesses, the amount of people involved, the fact that someone has lost their life, someone was injured" all make this case complicated, according to Rios.

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The complication of the case is only compounded when trying to piece together all of the evidence, Rios explained.

"It's a puzzle," he added. "Nothing is clear-cut at this point."

New Mexico authorities said Wednesday they have recovered a lead projectile believed to have been fired from the gun used in the fatal movie-set shooting.

New Mexico authorities said Wednesday they have recovered a lead projectile believed to have been fired from the gun used in the fatal movie-set shooting. (AP Photo/Andres Leighton)

During the press conference, Santa Fe sheriff Adan Mendoza said it's "too early" to tell if criminal charges will be brought in this case.

Baldwin accidentally shot and killed Hutchins last week after he was handed what he believed to be a "cold gun" by assistant director Dave Halls. Per the Associated Press, Halls was unaware live rounds were inside the firearm, according to an application for a search warrant executed by the Santa Fe County Sheriff's Office. Sheriff Mendoza reiterated those events at the top of the press conference.

Halyna Hutchins Rust

Cinematographer Halyna Hutchins was accidentally shot and killed after Alec Baldwin fired a gun that he was told was ‘cold’ on the set of his upcoming movie 'Rust.' (Photo by Mat Hayward/Getty Images for AMC Networks)

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An inventory report obtained by Fox News on Tuesday revealed that authorities collected three revolvers, a fanny pack with "ammo," "loose ammo," nine "spent casing(s)" and 14 swabs of "suspected blood" from the movie set among other items while executing the warrant.

Sheriff Mendoza explained that 500 rounds of ammunition were taken from the scene. Those rounds included dummies, blanks and live rounds, according to the sheriff.