Two armed groups engaged in heavy clashes in Tajoura neighbourhood, some 20km to the east of Tripoli on Monday.
It is not clear what triggered the fighting, but local sources indicated that the clashes broke out for revenge after the killing of one group gunman by the other armed group.
Reports say the fighting took place around a government prison and near Tajoura Heart Hospital. Several gunmen were killed and others injured in the clashes, the sources say, adding that the main highway was also closed due to the clashes.
The city's notables are exerting efforts to curb fighting between the warring groups.