One person was killed and ten people have been wounded in clashes in south Beirut between supporters of Syrian President Bashar al-Assad and rival fighters.
The fighting broke out before dawn between gunmen loyal to Shaker Barjawi, a Sunni Muslim who supports the Syrian Alawite president, and Sunni Muslims who back the three-year uprising against Mr Assad's rule.
Residents heard the sound of loud gunfire and explosions coming from the Al-Gharbi district of southern Beirut, where Mr Barjawi has an office.
Security sources named the dead man as Nabil Hannash. Several other people including civilians, were wounded in the clashes, they said.
The army later deployed in the area and the clashes appeared to subside.
The fighting in Beirut follows a week of sustained violence in the northern city of Tripoli, where 27 people have been killed in fighting between Assad supporters and opponents which also sparked clashes with the Lebanese army.