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Also the UK banned him from re entry-shouldn't that data have been uploaded to the US in real time-I thought we shared everything?
It is the same material used by shoe bomber Richard Reid when he attempted to blow up an American Airlines flight from Paris to Miami three days before Christmas in December 2001. PETN is a colourless, crystalline material which is highly explosive and similar in chemical composition to nitroglycerine.
More sensitive to shock or friction than TNT it was developed by the Germans and used in the First World War.
It has become popular with terrorist organisations because it is small, easy to conceal and powerful. PETN is one of the ingredients contained in the plastic explosive Semtex, which was also a favourite with terrorist groups because of its difficulty to detect.
It is believed Farouk Abdul Mutallab had moulded a quantity of the explosive powder to his body, sewn into his underwear in a six inch packet. He then attempted to detonate the device using a syringe containing a liquid, which was later recovered on the aircraft by FBI agents.