Abdulmutallab tried to ignite a two-part concoction of PETN and possibly a glycol-based liquid explosive. It set off popping, smoke and some fire but no deadly detonation, because he used the wrong technique. | Abdulmutallab tried to ignite a two-part concoction of PETN and possibly a glycol-based liquid explosive. It set off popping, smoke and some fire but no deadly detonation, because he used the wrong technique. |