Libya’s National Oil Corporation said Tuesday that an armed group blockading two major oil fields had lifted its siege and that production had resumed at one of them. The NOC had announced the suspension of production on Sunday at the vast Al-Sharara and Al-Fil fields after gunmen closed pipelines to the coast, the latest such shutdown in the crude-rich North African country’s decade-long conflict. The firm had declared force majeure, a legal move releasing it from contractual obligations due to circumstances beyond its control. In a statement on Facebook on Tuesday, the NOC announced “the reo…