A Mississippi woman is behind bars after a graphic video posted to social media showed her committing a sex act with a dog.

The Jones County Sheriff’s Department charged Denise Frazier, 19, with unnatural intercourse and aggravated cruelty to an animal, WDAM reported.

The sheriff’s department says it was tipped to the incident by a “concerned resident” who apparently saw the video.

“In my 17 years in law enforcement, this is one of the most disturbing cases that I’ve ever investigated,” said Sgt. J.D. Carter, who is leading the investigation. “JCSD is in possession of several videos that are so graphic that we are not at liberty to release them or even discuss the particular content.”

“The investigation into this case is far from over,” Carter added.

Frazier is being held at the Jones County Adult Detention Facility pending a court appearance on Thursday.

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[Featured image: Denise Frazier/Jones County Sheriff’s Department]