(Adds suspected car bomb networks targeted in Syria) BEIRUT, March 23 (Reuters) - One person was killed and 10 people were wounded in clashes in south Beirut on Sunday between supporters and opponents of Syrian President Bashar al-Assad, security sources said. The fighting broke out before dawn between gunmen loyal to Shaker Barjawi, a Sunni Muslim who supports the Alawite president, and other Sunni Muslims who back the three-year uprising against Assad's rule. Residents heard the sound of loud gunfire and explosions coming from the Al-Gharbi district of southern Beirut, where Barjawi has an ******. Security sources named the dead man as Nabil Hannash.