James Holmes reportedly used a thermos, remote-control car, frying pan and volatile chemicals to booby-trap his apartment to blow up after the Aurora theater shootings this past July according to a report by NBC.
Bomb technician Garret Gumbinner reported the findings while on stand for a preliminary hearing. Authorities first found a trip-wire leading from a door to a thermos that was filled with glycerin located over a frying pan filled with potassium permanganate according to Gumbinner.
Next they located a remote-controlled "pyrotechnic box" that was full of 6-inch firework shells. Holmes had left the remote for it outside, in a trash bag with a toy car and a boom box that was programmed to start playing music after 49 minutes according to the report.
His computer was also set to play music as well, hoping that someone would "call the police and the police would respond" to the loud noise according to Gumbinner.
"He said he rigged his apartment to explode or catch fire in order to divert police resources to his apartment," Gumbinner said, recounting his interview with Holmes according to NBC.
Holmes hoped that someone would hear the music, open the bag, decide to play with the car or with the remote at least, and the explosives would go off.
The report detailed at least a dozen explosive devices in the apartment loaded with napalm, smokeless powder, and live ammunition. Carpets were also soaked with oil and gasoline to help fuel any blast that went off. At least three glass jars were filled with a deadly homemade chemical mixture that would burn "so hot it could not be extinguished with water' according to ABC.
When Holmes was arrested outside the theater, he told police about the trap he set and the bomb squad was sent a robot to investigate the grad-school dropout's apartment.
Holmes purchased four guns between May and July, two handguns, a rifle and a shotgun according to an agent from the Bureau of Alcohol, Tobacco and Firearms. He also purchased 6,200 rounds of ammunition. He used those guns to kill 12 people and injured 58 others who had gone to the midnight screening for the movie "The Dark Knight Rises" in Aurora, Colorado.
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