A local official has been killed and a militia base reduced to ruins in a clash between rival groups near the Libyan capital, Tripoli.
It's the latest flare-up between militias that is destabilising the new Libya.
Two months after Muammar Gaddafi was killed, the country's new government is still unable to impose its authority on the ground.
Security is in the hands of militias that answer only to themselves and often wage turf wars with their rivals.
In a report released last week, the United Nations identified Libya's disparate militias as a major challenge continuing to face the National Transitional Council, the interim leadership that replaced Colonel Gaddafi.