Hezbollah chief Hassan Nasrallah (screen-C) delivers a speech to supporters gathered in southern Beirut on May 25, 2009 during a festival marking the ninth anniversary of Israel's withdrawal from southern Lebanon after a 22-year presence. A report that Hezbollah was behind the 2005 assassination of ex-premier Rafiq Hariri is a dangerous claim which could spark civil strife as Lebanon prepares to hold crunch elections, analysts believe. Germany's Der Spiegel news magazine reported on May 23 that the UN commission probing the Hariri murder had new evidence that Hezbollah special forces "planned and executed" the Beirut car bombing on February 14, 2005.