The police chief in Aurora says investigators are building a case to show that the suspect in the Colorado theater shooting is a very intelligent person who methodically plotted the attack.

Chief Dan Oates told CBS' "Face the Nation" on Sunday police are focusing on how James Holmes allegedly got materials used in Friday's shooting. He says police will be going over items taken from his apartment over the next couple of days.

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Oates says he had never seen a booby trap as elaborate as what was found in Holmes' apartment, noting that a second triggering mechanism was found.

Oates says the setup speaks volumes about Holmes' intelligence, deliberation and cold-bloodedness.

He says an FBI behaviorist is helping in the investigation.





The Associated Press contributed to this story.