A 16-year-old boy died of wounds suffered during clashes on Friday night, the official told AFP, adding that a total of 112 had also been wounded since street battles first erupted in the city on Monday.

A ceasefire brokered by local officials was supposed to take effect Wednesday, but violence was reignited when a sniper killed a Sunni cleric on Friday.

"There is now a cautious calm in the city, with sporadic sniper fire. Army foot patrols are responding to the sources of the shooting," the security source said.

He said shops were shut on Syria Street, which acts both as a dividing line between the rival neighbourhoods and as the frontline when fighting erupts.

The latest violence in Tripoli came on the heels of a spate of kidnappings in Lebanon linked to the conflict in neighbouring Syria.