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It is thought that the detonator was made of lead azide in a syringe which was set to react with PETN high explosive inside the toner cartridge of two desk top printers.
US investigators believe that the terrorists had performed a dry run from Yemen in order to time when the aircraft carrying the packages would be over the Atlantic.
German officials have revealed that the British bomb contained 300g of the high explosive PETN, one of the components of Semtex, and the device in Dubai contained 400g.
Analysis: Azide is a classic primary and its quite possible a cellphone could put out enough current to detonate it. 300g PETN is more than enough to take out a plane at altitude.
Supposedly one bomb was 17 min away; so score goes to Al Q on this round.
