A journal left behind by the gunman who launched a mass attack in a Louisiana movie theater last summer did not provide a clear motive for the deadly shooting, authorities say.

John Russell Houser fatally wounded two people and injured nine before killing himself on the night of July 23.

Houser’s journal was released by authorities on Wednesday. The hand-written, 40-page journal paid tribute to Charleston shooter Dylan Roof, and described America as a “filth farm.” Authorities believe Houser was mentally unstable.

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