Libya’s crude output dropped after clashes forced two of the country’s biggest oil ports to shut down, threatening the OPEC member’s efforts to revive the production of its most important commodity. The North African country’s production fell to 650,000 barrels a day from about 700,000 barrels a few days ago, according to a person with knowledge of the matter, who asked not to be identified because the person isn’t authorized to speak to media.

Libya, the holder of Africa’s biggest crude reserves, is ramping up output from its biggest oil field again after two years of internal conflict, the latest reminder of just how vulnerable OPEC’s quest to clear a global crude glut might be. The Sharara deposit in the Libya’s south west will ship almost 1.9 million barrels this month from its Zawiya port near Tripoli, according to a loading program obtained by Bloomberg.