Libya, a major oil producer in North Africa, has been mired in conflict since the 2011 NATO-backed uprising that toppled longtime ruler Muammar Gaddafi.
It is now split between two rival administrations: the UN-recognised Government of National Accord (GNA) based in Tripoli and the eastern-based House of Representatives allied with renegade commander Khalifa Haftar and his Libyan National Army (LNA).
Forces fighting for Libya's internationally recognised government said they regained full control over Tripoli and areas around the capital after being besieged for more than a year by militias loyal to the LNA.
Libyan fighters allied with the country's internationally recognised GNA have pressed their advance into the strategic city of Sirte, boosted by recent battlefield gains and the rapid withdrawal by Haftar's forces from western Libya.
The GNA's offensive comes despite a unilateral ceasefire proposal over the weekend by Egypt, a LNA backer.
Beyond Sirte, located 450km (280 miles) east of Tripoli, lies the prize of Libya's main oil export ports, Haftar's most important strategic asset.
Battle for Libya [Alia Chughtai/Al Jazeera]
Source: Al Jazeera