(NewsNation) — A librarian in Minnesota may have stopped a violent crime from occurring, according to court documents filed this month.

Robert Ivers is charged with threatening to assault or murder a federal judge, according to the 16-page affidavit filed in federal court.

On Sept. 3, police responded to the public library in Wayzata, Minnesota, after library staff allegedly saw Ivers copying a document called “How to Kill a Federal Judge."

Ivers allegedly showed a librarian the manuscript, including a page that stated “something about killing children,” the affidavit read.

Before exiting the library, Ivers gave the staff a copy of his manuscript, the court document stated.

After his arrest, authorities looked at the manuscript, which had a photo of a man pointing a rifle on the cover

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