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Evidence has been unearthed that strongly suggests Israel's infamous Prisoner X, who was jailed under extraordinary circumstances in 2010, was an Australian national from Melbourne.Investigations by the ABC's Foreign Correspondent program have revealed Ben Zygier, who used the name Ben Alon in Israel, was found hanged in a high-security cell at a prison near Tel Aviv in late 2010.His body was flown to Melbourne for burial a week later.The death goes part of the way to explain the existence in Israel of a so-called Prisoner X, widely speculated in local and international media as an inmate whose presence has been acknowledged by neither the jail system nor the government. The case is regarded as one of the most sensitive secrets of Israel's intelligence community, with the government going to extraordinary lengths to stifle media coverage and gag attempts by human rights organisations to expose the situation.