The officers noticed Holmes was wearing non-police tactical gear and apprehended him after a shooting rampage that claimed the lives of 12 people at a screening of "The Dark Knight Rises."
Holmes had opened fire inside the theater with a Smith & Wesson M&P15 rifle, Remington 870 shotgun, and .40-caliber Glock. A second .40-caliber Glock was recovered from his vehicle.
A federal law enforcement official told the
Washington Post
that a weapon malfunction likely saved lives by forcing Holmes to abandon the M&P15 he had equipped with a 100-round drum magazine after it jammed.
In the two months leading up to the shooting, Holmes stockpiled ammunition mostly with online orders. He had purchased about 6,000 rounds of ammo, some of which he had delivered to his workplace at the University of Colorado's Anchutz Medical Campus, reports
Bloomberg.
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