At least one person was killed and 11 others injured Friday in heavy clashes in Lebanon's northern city of Tripoli, the state-run National News Agency reported.
The fighting, which began earlier in the week, involved rival gunmen from the neighborhoods of Bab al-Tabbaneh and Jabal Moshen, dpa reported.
According to a witness in Bab al-Tabbaneh, gunmen used rockets and machine guns as sniper fire covered both neighbourhoods.
The Lebanese army carried out patrols in the areas that separate the two districts and at the city's entrances, the agency said.
Clashes broke out on Monday evening as celebratory gunfire erupted in Jabal Mohsen, a neighbourhood dominated by Alawites, who support President Bashar al-Assad.
They celebrated after al-Assad told Lebanese broadcaster al-Mayadeen that he sees no obstacles for him to run in the 2014 presidential election.
Baba al-Tabbaneh is a Sunni neighbourhood that supports the Syrian opposition rebels in their uprising against al-Assad.
The clashes have killed at least five people and wounded 60 others since Monday.