Forces answering to Libyan strongman Khalifa Haftar battled units that back Tripoli's unity government on the edge of the capital Friday, days into a new round of conflict that has killed dozens and displaced thousands.
Dozens of people have been killed and more than 300 wounded over the last eight days, the World Health Organization said on Friday.
French authorities said Friday they were in touch with all parties to Libya's conflict. But they did not confirm a report in Italy's La Repubblica, citing a source at the French presidency, saying Haftar had sent envoys to Paris several hours before he launched his offensive on Tripoli on April 4.
"We were not warned about the offensive on Tripoli, which we condemned when it was launched," she said.
The LNA and Haftar refuse to recognise the authority of Sarraj's Government of National Accord (GNA).
His forces swept from their eastern stronghold through Libya's sparsely populated desert, including parts of the south, before announcing their assault on to Tripoli.
Haftar's men were fighting GNA troops in the southern suburbs of the capital Friday, particularly in Ain Zara, Wadi Rabi and al-Swani, about 20 kilometres (12 miles) from the city centre.
AFP journalists saw an air raid in Wadi Rabi, while other witnesses reported another air strike in Tajoura, in the eastern suburbs of the capital, apparently targeting a military academy.
"A column of smoke was rising from this site into the sky," witnesses said.
Anti-aircraft fire was also heard in the region, near the capital's Mitiga airport which was hit by the LNA in an air strike on Tuesday.
An air strike Friday targeted an "empty and unused" barracks south of Zouara, near the Tunisian border, about 100 kilometre west of Tripoli, a security source said.
The strike did not cause casualties, the source said, attributing the attack to Haftar.
The United Nations had vowed to push on with a planned national conference set to begin Sunday to draw up a roadmap to elections, but has postponed it as the fighting escalated.
The long-mooted polls are meant to turn the page on years of turmoil that have engulfed the north African country since Kadhafi was deposed in 2011.
World powers, the UN and NATO have called for calm in Libya, but the clashes have shown no sign of abating.
International aid groups have warned migrants could be used as human shields or forcibly recruited to fight.
"Our teams are working around the clock to provide much needed humanitarian support in Tripoli and across Libya.
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