#6. Ibrahim al-Asiri AKA Abu Saleh
Ibrahim is a Saudi militant and chief bomb-maker for al-Qaida. He’s uses PETN in bombs – a white,
odourless powder that X-ray machines struggle to pick up. And he is thought to have designed the ‘underwear’ bomb used in an attempt to blow up a US-bound plane in 2009. And printer bombs sent from Yemen and destined for the US. Finally his most significant threat, according to intelligence, is that he is teaching his techniques to al-Qaida apprentices.He caused the ‘credible threat’ warnings issued by the US in July 2014 and led to increased security on all direct flights. Abdullah died in the attempt, but bin Nayef survived with minor injuries in 2017.