AURORA, Colo. –  Police say they believe the suspect in a deadly shooting at a Colorado movie theater planned the attack with “calculation and deliberation,” as they removed all explosives from his booby trapped apartment.

The suspect, James Holmes, is accused of going on a shooting rampage at the movie theater during Friday’s midnight showing of “The Dark Knight Rises,” killing 12 people dead and injuring 58. He was packing as many as 6,000 rounds of ammunition with the ability to shoot up to 50 a minute, police said.

Fox News has learned a possible second person of interest in the case is also being investigated, though sources caution authorities are not yet sure if the individual is necessarily tied to the crime.

In a statement to Fox News early Sunday, the Aurora Police Department confirmed an “associate” of Holmes had been interviewed in relation to the case, but at this time they do not believe he was involved.

The person who owns the home where the reported person of interest lives tells FoxNews.com investigators are looking for his tenant because they have interviewed all students from Holmes’s program and his tenant is the only one who they haven’t been able to reach. However, the landlord said he believes the tenant has been in Korea for “weeks.”

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