Teenage gunman hid an AR-15-style rifle in his backpack

The 14-year-old shooter, Colt Gray, confessed to killing four people at a US high school after leaving his classroom with his belongings and returning with a rifle in his backpack, authorities revealed. Gray brought the gun into the school on his own, and the assault-style rifle could not be broken. The deadliest US school shooting this year took place in Winder, Georgia on September 4.

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