The violence roiling Libya has increasingly targeted oil companies and their assets, upending long-term investments by Western companies and driving down production in a country that helped launch the world-wide rout in oil prices. In just three months, Libyan oil production has fallen from nearly 900,000 barrels a day in October to about 325,000 barrels a day in January, largely because of oil fields being taken over by armed Libyan groups or shutdowns due to security concerns, according to officials at the National Oil Co. The plunging output comes after civil war broke out mid-2014 and caused two big closures at the end of the year. French major Total SA closed the Mabruk oil field in central Libya, a facility that once produced 30,000 to 40,000 barrels a day. And the country’s main oil port, known as Sidra, was closed […]