Libya's beleaguered elected parliament has declared a formal alliance with a renegade former general, as it struggles to assert some authority in a country many fear is sliding into outright civil war.
Three years after the overthrow of Muammar Gaddafi, the oil-producing desert state is in chaos, with Islamists and other militias fighting for territory and influence and the regular armed forces left with little power.
One militia faction has seized Tripoli, setting up its own assembly and administration in the capital and forcing the government to take refuge in the eastern part of the country.
Khalifa Haftar, a former general under Gaddafi, is one of dozens of commanders of irregular forces calling the shots in the country. Last week, his forces launched a new offensive against Islamist militias in the eastern city of Benghazi.
The House of Representatives, Libya's elected parliament which has relocated to Tobruk in the far east, has endorsed Haftar's Operation Dignity against Islamists, giving him an official role, parliament spokesman Farraj Hashem said.
"Operation Dignity is leading officers and soldiers of the Libyan army ... Operation Dignity is an operation of the Libyan army," he said late on Sunday.
The move appears to contradict past calls from the House of Representatives for all militias to be disarmed to help restore order and rebuild the state.
The decision to endorse Haftar might also worsen a conflict between the House of Representatives, allied to the internationally-recognised government of Prime Minister Abdullah al-Thinni, and the new rulers of Tripoli.
Both recognised bodies have been based in eastern Libya since an armed group led from the western city of Misrata seized Tripoli in August and set up its own assembly and government there.
The Misrata faction has denounced Haftar as a Gaddafi loyalist who is trying to stage a counterrevolution with other officials of the former regime. Haftar helped Gaddafi seize power in 1969 but fell out with the former dictator in the 1980s.
At least 73 people were killed in fighting between Haftar's troops backed by armed local youth and army forces against Islamist brigades in Benghazi since Wednesday, hospital medics said.
Fighting was continuing inside Benghazi university and another part of Libya's second-largest city, residents said. Some 99 civilians were evacuated from areas heavily affected by clashes, among them families from Egypt and Chad.