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According to a police probable cause statement, she said she believed her son had amassed weapons similar to those used by the gunman who attacked a theater in Aurora, Colo., in July during a showing of the latest Batman movie. That attack killed 12 people.

Lammers was questioned Thursday afternoon and told authorities he bought tickets to a Sunday “Twilight” screening in Bolivar and planned to shoot people inside.

Lammers also said he planned to “just start shooting people at random” at the Wal-Mart store less than a mile away, so if he ran out of bullets, he could “just break the glass where the ammunition is being stored and get some more and keep shooting until police arrived,” investigators wrote.

The probable cause statement said Lammers was “off of his medication,” but his mother said Tuesday that to her knowledge, that wasn’t true.