By Benoît Faucon 

LONDON--The reopening of Libyan oil fields and ports this month has been a key factor behind a steady fall in international oil prices recently, with U.S. prices falling to a four-month low on Thursday.

But markets may be overlooking resurgent risks to the North African country's oil supply.

Over the past week fighting for control of the airport in Tripoli, Libya's capital, has set ablaze part of a storage facility holding 90 million liters (almost 24 million gallons) of oil during the worst violence in the country since the 2011 civil war that led to the downfall of former leader Moammar Gadhafi.

The oil tank blazes and fighting in Tripoli and the eastern city of Benghazi have led to "serious doubts" about the safety of Libya's oil fields, Commerzbank commodities analysts said in a note.

"The current oil price continues to insufficiently reflect the risks to the oil supply." Commerzbank said.

Brent crude peaked at around $115 per barrel in mid-June amid supply fears after Sunni militants seized large parts of western Iraq.

But the price has since fallen by around $9 as a revival of Libya's oil industry spurred hopes supply from there could replace barrels that might be lost from Iraq. Brent crude was trading below $106 per barrel Friday.

On the New York Mercantile Exchange, light, sweet crude declined 2.1%, to $98.17 a barrel Thursday, the lowest price since March 17, and was still declining Friday.

Following an end to protests by a local ethnic group at the country's largest oil field, called Sharara, Libya's oil production surged to a five-month high in mid-July to about 600,000 barrels a day--one third of which came from Sharara.

Meanwhile Libya's government announced an agreement in July with rebel forces that had occupied eastern ports for nearly a year, sparking hopes exports would soon rise.

But the reopening of ports and oil fields has translated into only a trickle of extra exports as Libya struggles to sell its oil, while the current turmoil is threatening whatever progress has been made.

The clashes that erupted on July 13 between two rival Libyan militia over Tripoli airport have already dented production at both Sharara, where Spain's Repsol S.A. is a joint venture partner, and el-Feel, another Sahara oil field where Italy's Eni SpA is a partner. Workers are unable to travel to the fields because roads are too unsafe, reducing the number of staff manning the operations, according to other staff there.

Expatriates working for France's Total S.A. in Libya have evacuated the country, the company said on July 15. Foreign workers for Eni and Repsol have mostly left the country too, staff at their joint ventures have said.

The departure of oil-firm expatriates will harm production if the violence doesn't abate, said Tarek Alwan, managing director of SOC Libya, a consultancy that advises international companies.

A week after the fighting broke out Libya's state-owned National Oil Co. acknowledged the country's output had fallen back by around 100,000 barrels a day.

The same militias fighting for control of Tripoli's airport also hold sway over oil supplies from Sharara--sparking fears among Libyan oil officials that these groups could use their military power to shut its oil flows altogether. For example, gunmen hailing from the mountain town of Zintan control land crossed by the oil pipeline that leads from Sharara to the oil terminal of Zawiya.

Meanwhile, no oil has been shipped from the two key Eastern oil ports that reopened this month as buyers, primarily in Europe, fear supplies are too unreliable to be ordered.

Nicole Friedman in New York contributed to this article

Write to Benoît Faucon at benoit.faucon@wsj.com

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