During his arrest the 24-year-old shooting suspect told police he had booby-trapped his third-floor apartment, prompting investigators to evacuate the building and four others nearby. Authorities spent Friday and Saturday trying to disarm possible explosives and collecting various materials, like some 30 softball-sized containers filled with gunpowder that were found in Holmes' apartment. Ret. FBI … Continue reading Ret. FBI Agent says Holmes' execution came down to “his motive, his ability to get these components and his education.”