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Those dangerous materials, along with magazines for firearms and ammunition, are believed to have been purchased through the mail, not taken from the University of Colorado Anschutz Medical Campus where Holmes was a graduate student.
Police evacuated two research buildings that Holmes had key-card access to while he was a student in a neurosciences program on the Anschutz Medical Campus on Friday. The buildings were searched by bomb-detection dogs, Oates said.
"We did a thorough search of those facilities, and, as we’d hoped, there were no hazards found," he said.
Oates would not specify what materials Holmes had delivered to his home but said they indicated a level of premeditation.
"There is some evidence here, I think, of some calculation and deliberation," Oates said.
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