According to an arrest affidavit, investigators discovered triacetone triperoxide (TATP) and methyl ethyl ketone peroxide (MEKP) — both highly combustible homemade explosives — in his bedroom.

In addition to TATP, technicians also discovered Methyl Ethyl Ketone Peroxide, or MEKP, which is also a highly combustible explosive. The affidavit states that on April 16, APD Bomb Squad ...