The two suspects in a deadly school shooting in Colorado stole the guns they used in the attack from one of the shooter’s parents and the armed guard at the school played a key role in containing the violence according to a new report.

Citing high-ranking police sources, a local television station in Denver reported the suspects “smashed into the locked gun cabinet at the home of the adult suspect’s parents Tuesday morning, stole the weapons and used them in the shooting later that day.”

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