On 18 December 2006, a progress report by former head of the investigation, Serge Brammertz, indicated that DNA evidence collected from the crime scene suggests that the assassination might be the act of a young male suicide bomber.
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Irish journalist Lara Marlowe with whom Hariri talked reported similar allegations.
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On 7 February 2012, Hurriyet reported investigators from the United Nations interviewed Louai Sakka, interested in whether he had played a role in the assassination.
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Jürgen Cain Külbel: Mordakte Hariri: Unterdrückte Spuren im Libanon, 2006, ISBN 3-89706-860-5
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The report uncovered documents suggesting the UN investigative body had strong evidence to link the Shia paramilitary group Hezbollah to the 2005 bombing that killed Hariri, and that the UN had not acted on this intelligence due to diplomatic concerns.
Eido was assassinated just three days after the UN Security Council Resolution 1757 came into effect, mandating the establishment of a hybrid Lebanese-international tribunal to investigate suspects of the Hariri assassination and other similar attacks.