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Ethan Crumbley, then 15, had wrote in his journal: "I want help but my parents don't listen to me so I can't get any help."
The accused, Jagan of Mulayam, told the police that he saved the money given to him by his father to buy the air gun from Trichur Gun Bazar.
The incident occurred at a Covenant School in Nashville, Tennessee.
Russia's Investigative Committee, which handles major crimes, said it was looking into the attacker's suspected neo-Nazi links.
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