The suspect in Friday's (July 20) shooting at an Aurora, Colorado, midnight showing of "The Dark Knight Rises" had been planning the attack for at least two months, new reports indicated.

According to NBC News, James Holmes, 24, the suspect in the Friday massacre that left 12 dead and 58 injured, began legally purchasing weapons and ammunition in May. Holmes also extensively booby-trapped his apartment, located roughly five miles from the theater. Aurora police chief Dan Oates told reporters on Friday that five buildings around Holmes' apartment building had been evacuated while authorities determined how best to handle the explosives inside. Oates described the scene inside as "pretty disturbing."

CBS News reports that investigators are now preparing to detonate the apartment building if they can't safely gain access.

Holmes has reportedly been uncooperative thus far with the police investigation, but during President Barack Obama's weekly address on Saturday (July 21), the president assured that whoever was responsible for the grisly attack would be held accountable.

Click here for photos from the scene in Aurora, Colorado.

"We're still gathering all the facts about what happened, but we do know the police have one suspect in custody," he said. "The federal government stands ready to do everything necessary to bring whoever is responsible for this heinous crime to justice. We will take every step possible to ensure the safety of all our people and we will stand by our neighbors in Colorado during this extraordinarily difficult time.

"If there's anything to take away from this tragedy, it's a reminder that life is fragile," he continued. "Our time here is limited and it is precious. And what matters in the end are not the small and trivial things which often consume our lives. It's how we choose to treat one another, and love one another. It's what we do on a daily basis to give our lives meaning and to give our lives purpose. That's what matters. That's why we're here."

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