A storehouse belonging to Libya's Mellitah Oil & Gas, a joint-venture between the National Oil Corporation (NOC) and Italy's Eni, was damaged in an air strike on Tuesday, wounding three workers, the state oil company said in a statement.

It was the first confirmed attack on a foreign oil asset since eastern forces led by Khalifa Haftar started a campaign with ground and air forces to take the capital Tripoli, held by the internationally recognised government.

"We are witnessing the destruction of the corporation's facilities before our eyes," NOC chairman Mustafa Sanalla said after the incident.