Crude production at Sharara oil field, southwestern Libya, was halted on Sunday after a tribal militia from the mountain town of Zintan closed Al-Rayana pipeline connecting the country’s largest oilfield with Zawiya oil terminal a day before.

The National Oil Corporation declared force majeure on the oil field, a week after production reached 230.000 bpd. 

The demands of the armed group are yet to be known.

The Zintani militia had closed Sharara oil field several times before.  

Sharara oil field is run by the NOC in a joint venture with Spain’s Repsol.