Agents for Britain's MI5 intelligence service have discovered that Muslim doctors trained at some of Britain's leading teaching hospitals have returned to their own countries to fit surgical implants filled with explosives, according to a report from Joseph Farah's G2 Bulletin. Women suicide bombers recruited by al-Qaida are known to have had the explosives inserted in their breasts under techniques similar to breast enhancing surgery. The lethal explosives – usually PETN (pentaerythritol Tetrabitrate) – are inserted during the operation inside the plastic shapes.