Police: Colo. suspect planned massacre for months [View all]

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AURORA, Colo. (AP) -- Details emerging on the Colorado massacre suspect show a budding scientist, brimming with potential, who pursued a graduate program even as he assembled weaponry he would allegedly use in the deadly midnight rampage inside an Aurora movie theater.

James Holmes planned the attack with "calculation and deliberation," police said Saturday, receiving deliveries by mail that authorities believe armed him for battle and were used to rig his apartment with dozens of bombs.

Meanwhile, a federal law enforcement official provided an updated account about the gunfire inside the theater, saying that a semi-automatic assault rifle used by the shooter jammed during the attack, forcing him to switch to another weapon.

The official, who spoke on condition of anonymity to in order to discuss the investigation, said that the jammed weapon had a high-capacity ammunition magazine. Police have said that a 100-round drum magazine was recovered at the scene and that such a weapon would be able to fire 50 to 60 rounds a minute.