After the funeral at the massive Al-Amine Mosque, Hassan was to be buried in the mausoleum of his mentor, former premier Rafiq Hariri.
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The Syrian army withdrew from Lebanon in 2005 after an almost 30-year occupation.
Wissam al-Hassan was accused of aiding rebels fighting Al-Assad’s regime
Hassan, a top Lebanese security official killed Friday in a Beirut car bombing, suspected the regime in neighbouring Syria of murdering his mentor, former Prime Minister Rafiq Hariri.