Tripoli - Libya has made more progress in extinguishing a fire at oil storage tanks at the country's biggest oil port, Es Sider, that has been raging for one week, a member of a fire-fighting crew said on Thursday.Es Sider and its adjacent Ras Lanuf terminal have been closed since a group allied to a rival government in Tripoli moved three weeks ago to try and take them, part of a struggle between former rebels who helped topple Muammar Gaddafi in 2011 but are now fighting for power and a share of oil reserves.A week ago, a rocket hit Es Sider's storages, destroying up to 1.8 million barrels of crude and at least two tanks, a top official has said."We've managed to extinguish all but one tank storage," said a firefighting official. "Tomorrow we hope to finish the job."The battle for control of the oil ports is part of a wider struggle in the North African country which has had two governments since a group called Libya Dawn seized the capital in August by expelling a rival faction, installing its own prime minister and forcing the recognised premier, Abdullah al-Thinni, to operate out of the east with the elected House of Representatives.The fighting has reduced Libya's crude output to around 380 000 barrels a day, state-run National Oil Corp (NOC) has said.Es Sider is fed from fields run by Waha Oil Co, a joint-venture of NOC with US firms Hess, Marathon and ConocoPhillips.Thinni's government had said this week it had contracted a US firefighting firm for six million dollars. It was not clear whether it has arrived yet.