Sanalla also said an attack happened near Zella oilfield earlier on Saturday Daesh claimed responsibility for the attack through its Aamaq news agency JEDDAH: Libya"s National Oil Corporation (NOC) chief said on Saturday continued instability in Libya could make it lose 95% of its oil production. "Unfortunately if the situation will continue like this I’m afraid that maybe 95% of production will be lost," Mustafa Sanalla told reporters in Jeddah ahead of a ministerial panel gathering on Sunday of top OPEC and non-OPEC producers. Sanalla also said an attack had happened near Zella oilfield earlier on Saturday. Two guards were killed and four others were kidnapped early on Saturday in a suspected Daesh attack targeting the oilfield, a security source said. The attackers struck at an entrance gate to the field, which lies near the town of Zella about 760 km (470 miles) southwest of the capital, Tripoli. They killed the two guards before fleeing, the source and local residents asking not to be named told Reuters. Daesh claimed responsibility for the attack through its Aamaq news agency later on Saturday. The Zella field belongs to Zueitina Oil Company, which pumped 19,000 barrels per day on average in the last quarter of 2018 across all its fields. An engineer told Reuters workers at the field were safe and facilities had not been damaged. Daesh has been active in Libya in the turmoil since the overthrow of Muammar Gaddafi in 2011. The militant group took control of the coastal city of Sirte in 2015 but lost it late in 2016 to local forces backed by US air strikes. In the last two years, the group has targeted three state institutions in Tripoli, home of the Tripoli-based government of national accord led by Prime Minister Fayez Serraj. Saturday"s assault took place as general Khalifa Haftar"s Libyan National Army (LNA), which is allied to a rival administration in eastern Libya, mounts an offensive to control Tripoli.