On Saturday there was some discussion and one witness who said he saw someone open the back door to the movie theatre and then leave it open which some people thought was the work of an accomplice inside the theatre. Police believe that James Holmes actually propped it open himself after buying a ticket. Police also believe he had been planning the attack for four months. He bought his guns legally in Colorado and bought 6,000 rounds of ammunition online and all of his tactical bulletproof gear over the same time period too. As they identify everything he used to booby trap his apartment, they will probably discover when he bought that too. He had been getting a huge number of deliveries over the past several months.