Aurora Colorado Shooting

Police Arrest Man Planning Aurora-Style Breaking Dawn Shooting

Had purchased rifles and 400 rounds of ammunition

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A 20-year-old man is in custody after his mother contacted the police, fearing that he was planning to commit mass murder at a "Twilight" screening at a Missouri Walmart.

Court documents obtained by CBS affiliate KCTV in Kansas City, Mo. show that Blaec Lammers had purchased assault rifles and more than 400 rounds of ammunition. His mother had told authorities on Thursday that her son had purchased weapons similar to those used by James Holmes, the Colorado movie theater massacre shooter.