Prosecutors : NEW : Holmes called a university switchboard nine minutes before he allegedly opened fire . Holmes , 24 , is accused of killing 12 people in a theater shooting in Aurora , Colorado , last month . He was arrested on Friday and charged with murder by means of an instrument of crime after police found him at the scene wearing body armor and carrying two handguns during his arrest.
NEW : Holmes called a university switchboard nine minutes before he allegedly opened fire . Holmes , 24 , is accused of killing 12 people in a theater shooting in Aurora , Colorado , last month . He was arrested on Friday and charged with murder by means of an instrument of crime after police found him at the scene wearing body armor and carrying two handguns during his arrest.