Two people have been killed and more than a dozen injured after clashes between Sunni and Shi'ite gunmen in Lebanon, security officials said.
Troops managed to separate the gunmen and restore calm to two neighbourhoods in the capital Beirut where fighting had erupted.
Heavy overnight clashes were also reported in the northern city of Tripoli.
A man was killed in a shooting in the Wadi Zayneh area north of Sidon and another person died in the Tripoli clashes, officials said. At least six people were wounded in Beirut and 10 in Tripoli.
Lebanon has seen significant unrest since Friday after an anti-Syrian top intelligence official was killed in a car bombing.
The assassination has threatened to shatter the country's fragile political balance.
Many politicians have blamed Syria for the killing and angry protesters attempted to storm the government palace after Brigadier General Wissam al Hassan's funeral on Sunday.
There have been calls for Prime Minister Najib Mikati - whose government is dominated by pro-Syrian parties - to resign.
Mr Mikati offered to resign over the weekend, but will remain in position after President Michel Sleiman's request to avoid a "political vacuum" in the country.
The opposition bloc has blamed Syrian President Bashar al Assad for the bomb attack.
It also holds Mr Assad responsible for the 2005 assassination of former premier Rafik Hariri, who was also killed in a Beirut car bombing.