Smoke rises from burning oil storage tanks in the port of Ras Lanuf, Libya, January 23, 2016.

Maintenance teams are working to repair damage caused by an attack on an oil pipeline south of the Libyan port of Zueitina, a spokesman for the pipeline’s guards said on Monday.

It was not clear who carried out the attack late on Sunday evening, but Islamic State of Iraq and Syria (ISIS) militants have been active in the area in recent weeks.

An explosion and fire hit the pipeline in the desert 75 km (47 miles) south of the terminal, said Ali al-Hassi, a spokesman for the Petroleum Facilities Guard that controls nearby oil installations.

The pipeline leads from oil field 103 to the export terminal at Zueitina, which was closed last year by a conflict between Libya’s rival governments, one based in Tripoli and the second, internationnally recognised one in the east.

ISIS militants have taken advantage of political chaos and a security vacuum to establish a foothold in Libya. Last month, they launched a series of attacks causing major damage at the oil terminals of Es Sider and Ras Lanuf, which lie between Zueitina and the ISIS-controlled city of Sirte.

Libya’s oil production has shrunk to under 400,000 barrels per day, less than a quarter of the 1.6 million bpd it was producing before the uprising that toppled Muammar Gaddafi in 2011.

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