Libyan state oil firm NOC will reopen the El Sharara oilfield, the country's biggest, only after an inspection to establish security, a spokesman said on Tuesday, Reuters reports.
The comments came shortly after officials for eastern Libyan forces said they handed over control of the field to an oil security force to encourage NOC to restart production that has been halted since December.
Control over the oilfield has been claimed by different forces since tribesmen and state guards seized it in December, making financial and other demands. NOC declared force majeure, a waiver on its contracts.
"NOC has sent an inspection team to assess security at Sharara and to verify that all armed militia has left the field before force majeure being lifted," the spokesman said by text message.
A no-fly zone imposed by the eastern military meant this could take some days, he said, adding that the zone indicated a "serious continuing threat level."
The eastern military has said it will not allow flights to southern Libya without its permission.
"We call on NOC to lift force majeure," said Naji al-Maghrabi, the eastern-based commander of the state oil guards appointed to protect the field, in a statement posted online.
A spokesman for the eastern military confirmed the handing over of the field to the oil force.
There was no immediate comment from NOC.
It was not immediately clear if handing over security to guards under the control of an eastern-based commander would meet NOC's demands.
The eastern forces launched an offensive in mid-January to secure the southern oilfields, which include El Sharara.