I missed this at the time, but this Le Monde article says that Hizbullah (via al-Manar) has accused close Walid Jumblatt collaborator Marwan Hamade of helping the US Ambassador in Lebanon to locate Hassan Nasrallah during the Summer 2006 war -- so the info could be passed on to Israel. Walid Jumblatt has replied by, for the first time, directly accusing Hizbullah of having a hand "one way or the other, in some of the assassinations, if not all the assassinations."
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