Libya is reported to have halted crude oil exports from two key ports, in a move likely to affect the aframax and suezmax tanker markets.

The National Oil Corp (NOC) is said to have informed some trading and shipping companies of force majeure restrictions at the country’s biggest oil export terminal, Es Sider, and its third-biggest, Ras Lanuf, Bloomberg reported, quoting unnamed sources.

The move comes after the NOC said it might have to halt exports from the Gulf of Sirte, which includes both ports, as well as Brega and Zueitina.