Libya’s national oil company has declared a “state of emergency” after exports of its oil from the ports in the eastern part of the country were blocked by forces loyal to the Libyan National Army’s General Khalifa Haftar.

The Petroleum Facilities Guard – a militia that controls major export terminals in eastern Libya – has ordered local subsidiaries of the National Oil Corporation (NOC), who run them, to cease all operations, the firm said in a statement.

The move makes any export of oil from Libya impossible, the company then warned, adding that it would lead to losses in crude oil production amounting to 800,000 barrels per day, as well as daily financial losses estimated at about $55 million.

UN officials warned about “devastating consequences” such a move would have for the nation’s economy and for its people, and urged all sides to “exercise maximum restraint.”