Smoke rises after an airstrike hit Maitiga airport early Thursday morning, in Tripoli March 5, 2015. Fighting and air strikes have escalated even as the United Nations prepares to restart negotiations on Thursday between two factions in an attempt to broker a ceasefire, form a unity government and put Libya back on track to stability. REUTERS/Hani Amara (LIBYA - Tags: POLITICS CIVIL UNREST TRANSPORT)