Two employees of Libya's National Oil Corporation (NOC) were killed after a militant attack on the company’s headquarters in Tripoli on 10 September, media reports said citing local law enforcement agencies.

Two of the attackers have also been reported as killed.

Earlier in the day, witnesses reported hearing explosions and gunfire, with smoke rising from close to the NOC offices. Security officials said they were attempting to deal with militants attacking the building.

Security forces took up positions around the offices in central Tripoli, while surrounding roads were cordoned off.

Witnesses told media they saw ambulances leaving the site. A member of staff from a hotel next to the NOC offices said that he had heard around five blasts.

Tripoli has been shaken by clashes between rival armed groups since the beginning of September. The capital has also seen occasional militant attacks.

Libya’s oil production has plunged since the overthrow of long-serving ruler Muammar Gaddafi in 2011 during the Arab Spring.

Ever since, the country has been torn apart by civil war with rival factions vying for power.

Libya's revenue is heavily dependent on oil exports. Years of conflict have slashed output to 550,000 barrels a day (b/d) in June from the 1.6 million b/d it pumped before the 2011 civil war.