Clashes broke out between rival factions in Abu Salim neighbourhood of Tripoli on Thursday, eyewitnesses said.
Al-Burki and Ganiewa armed brigades exchanged fire and random shelling in highly populated areas causing panic among local residents.
There are reports of casualties from both sides.
Tanks and trucks mounted with heavy machine guns were seen roaming the streets.
The Libyan Red Crescent warned local residents near the clashes zone to stay at home and keep away from windows while it tries to find a safe corridor for them.
The reason behind the clashes is not clear, but sources claimed it is related to exchange of abduction of fighters by both warring factions.
