1. STOCKPILE

    Colorado Suspect Bought 6,000 Rounds

    AURORA, CO - JULY 20:  Police search what is believed to be the car of James Holmes, the suspect of a shooting in a movie theater, outside the Century 16 movie theater July 20, 2012 in Aurora, outside of Denver, Colorado. According to reports, 12 people have been killed and at least 38 wounded when James allegedly opened fire inside the a movie theater showing the "The Dark Knight Rises."  Police have James, 24, of Holmes of North Aurora, in custody.  (Photo by Thomas Cooper/Getty Images)

    Thomas Cooper / Getty Images ; (inset) University of Colorado / AP Photo

    Suspected Colorado gunman James Holmes was incredibly well-armed. In the past 60 days, reports ABC, he had purchased four guns at local shops and over 6,000 rounds of ammunition online. According to Aurora Police Chief Dan Oates, "All the ammunition he possessed, he possessed legally, all the weapons he possessed, he possessed legally, all the clips he possessed, he possessed legally." The weapons used in the theater shooting Friday were powerful enough to penetrate the walls, hitting at least one other person in an adjacent theater. Holmes was arrested shortly after the violence, while shooting at his car from behind the theater. Authorities haven't identified all of the 12 victims, while 30 remain hospitalized. Counting the injured, the Friday morning attack is the largest mass shooting in American history. "The gunmen never had to reload. Shots just kept going, kept going, kept going," a witness told ABC News.

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