Production at Libya's El Feel, Sharara and 108 oilfields has stopped after tribal leaders protested against the apparent arrest of a former finance minister.
The shutdown was confirmed by engineers working at the sites.
The closures are being led by the Al Zawi tribe against the disputed arrest of Faraj Bumatari on Tuesday.
The protesters released a video statement from the 108 oilfield saying they had closed a valve.
"We affirm the continuation of the oil closures and we may escalate the situation to more than that if our son Faraj Bumatari is not released," footage showed a man surrounded by others saying.
No protesters have entered the Sharara oilfield so far, two engineers working in the field told Reuters on Thursday, but the threat from the demonstrators was enough for production to be halted.
The Sharara field, one of Libya's largest production areas with a capacity of 300,000 barrels per day, has been a frequent target for protesters fuelled by political causes.
The site is in the Murzuq basin in the south-east and is run by state oil firm NOC via Acacus alongside Spain's Repsol, France's Total, Austria's OMV and Norway's Equinor.
El Feel field, with a capacity of 70,000bpd, is operated by Mellitah Oil and Gas, a joint venture between NOC and Italy's Eni.
No immediate comment was available from NOC.
Oil-rich Libya was plunged into over a decade of chaos after a Nato-backed uprising toppled and killed dictator Muammar Qaddafi in 2011.
The country has since been politically divided, with one administration in Tripoli and another in the east backed by Gen Khalifa Haftar.
The leader of Al Zawi tribe, Al Senussi Al Ahlaiq, told Reuters the closure of El Feel was aimed at pressuring authorities in Tripoli to release Mr Bumatari, who was reportedly arrested by security agents after arriving at Mitiga Airport on Tuesday.
The tribe, to which Mr Bumatari belongs, claims he was abducted.
Mr Al Ahlaiq said preparations were under way to close Tripoli's entire water supply.
Mr Bumatari is a candidate for the position of central bank governor, the tribe said in a written statement, which "makes him vulnerable to danger and kidnapping".
The UN mission in Libya said the "shutdown must be immediately ended".
The mission said five members of Libya's High State Council had also been banned from travelling at the same airport.
"These acts create a climate of fear, promote tension between communities and tribes," said the UN Support Mission in Libya (Unsmil).
ZAYED SUSTAINABILITY PRIZE
UAE currency: the story behind the money in your pockets
Company Profile
Name: JustClean
Based: Kuwait with offices in other GCC countries
Launch year: 2016
Number of employees: 130
Sector: online laundry service
Funding: $12.9m from Kuwait-based Faith Capital Holding
The Sand Castle
Director: Matty Brown
Stars: Nadine Labaki, Ziad Bakri, Zain Al Rafeea, Riman Al Rafeea
Rating: 2.5/5
MATCH INFO
Barcelona 4 (Suarez 27', Vidal 32', Dembele 35', Messi 78')
Sevilla 0
Red cards: Ronald Araujo, Ousmane Dembele (Barcelona)
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Lexus LX700h specs
Engine: 3.4-litre twin-turbo V6 plus supplementary electric motor
Power: 464hp at 5,200rpm
Torque: 790Nm from 2,000-3,600rpm
Transmission: 10-speed auto
Fuel consumption: 11.7L/100km
On sale: Now
Price: From Dh590,000
Miss Granny
Director: Joyce Bernal
Starring: Sarah Geronimo, James Reid, Xian Lim, Nova Villa
3/5
(Tagalog with Eng/Ar subtitles)
UAE currency: the story behind the money in your pockets
Director: Laxman Utekar
Cast: Vicky Kaushal, Akshaye Khanna, Diana Penty, Vineet Kumar Singh, Rashmika Mandanna
Rating: 1/5
Company profile
Date started: 2015
Founder: John Tsioris and Ioanna Angelidaki
Based: Dubai
Sector: Online grocery delivery
Staff: 200
Funding: Undisclosed, but investors include the Jabbar Internet Group and Venture Friends
COMPANY%20PROFILE
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The bio
Job: Coder, website designer and chief executive, Trinet solutions
School: Year 8 pupil at Elite English School in Abu Hail, Deira
Role Models: Mark Zuckerberg and Elon Musk
Dream City: San Francisco
Hometown: Dubai
City of birth: Thiruvilla, Kerala
RESULT
Los Angeles Galaxy 2 Manchester United 5
Galaxy: Dos Santos (79', 88')
United: Rashford (2', 20'), Fellaini (26'), Mkhitaryan (67'), Martial (72')
Florence and the Machine – High as Hope
Three stars
SHALASH%20THE%20IRAQI
%3Cp%3EAuthor%3A%20Shalash%3Cbr%3ETranslator%3A%20Luke%20Leafgren%3Cbr%3EPages%3A%20352%3Cbr%3EPublisher%3A%20And%20Other%20Stories%3C%2Fp%3E%0A
if you go
The flights
Etihad and Emirates fly direct from the UAE to Seoul from Dh3,775 return, including taxes
The package
Ski Safari offers a seven-night ski package to Korea, including five nights at the Dragon Valley Hotel in Yongpyong and two nights at Seoul CenterMark hotel, from £720 (Dh3,488) per person, including transfers, based on two travelling in January
The info
Visit www.gokorea.co.uk
Our legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
Barcelona 3
Messi (27’, 32’, 87’)
Leganes 1
El Zhar (68’)
MOUNTAINHEAD REVIEW
Starring: Ramy Youssef, Steve Carell, Jason Schwartzman
Director: Jesse Armstrong
Rating: 3.5/5
PREMIER LEAGUE FIXTURES
Saturday (UAE kick-off times)
Watford v Leicester City (3.30pm)
Brighton v Arsenal (6pm)
West Ham v Wolves (8.30pm)
Bournemouth v Crystal Palace (10.45pm)
Sunday
Newcastle United v Sheffield United (5pm)
Aston Villa v Chelsea (7.15pm)
Everton v Liverpool (10pm)
Monday
Manchester City v Burnley (11pm)
Star%20Wars%3A%20Episode%20I%20%E2%80%93%20The%20Phantom%20Menace
%3Cp%3E%3Cstrong%3EDeveloper%3A%3C%2Fstrong%3E%20Big%20Ape%20Productions%3Cbr%3E%3Cstrong%3EPublisher%3A%3C%2Fstrong%3E%20LucasArts%3Cbr%3E%3Cstrong%3EConsoles%3A%3C%2Fstrong%3E%20PC%2C%20PlayStation%3Cbr%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%202%2F5%3C%2Fp%3E%0A
The specs
Engine: 4.0-litre flat-six
Torque: 450Nm at 6,100rpm
Transmission: 7-speed PDK auto or 6-speed manual
Fuel economy, combined: 13.8L/100km
On sale: Available to order now
Results
6pm: Dubai Trophy – Conditions (TB) $100,000 (Turf) 1,200m
Winner: Silent Speech, William Buick (jockey), Charlie Appleby
(trainer)
6.35pm: Jumeirah Derby Trial – Conditions (TB) $60,000 (T)
1,800m
Winner: Island Falcon, Frankie Dettori, Saeed bin Suroor
7.10pm: UAE 2000 Guineas Trial – Conditions (TB) $60,000 (Dirt)
1,400m
Winner: Rawy, Mickael Barzalona, Salem bin Ghadayer
7.45pm: Al Rashidiya – Group 2 (TB) $180,000 (T) 1,800m
Winner: Desert Fire, Hector Crouch, Saeed bin Suroor
8.20pm: Al Fahidi Fort – Group 2 (TB) $180,000 (T) 1,400m
Winner: Naval Crown, William Buick, Charlie Appleby
8.55pm: Dubawi Stakes – Group 3 (TB) $150,000 (D) 1,200m
Winner: Al Tariq, Pat Dobbs, Doug Watsons
9.30pm: Aliyah – Rated Conditions (TB) $80,000 (D) 2,000m
Winner: Dubai Icon, Patrick Cosgrave, Saeed bin Suroor
Our family matters legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
