Libya's Defence Ministry has authorised its military to use force to stop a North Korea-flagged tanker loading crude oil sold by rebels, as the Tripoli government acts upon a warning it had issued a day earlier.
Rebels, who have seized three major Libyan ports since August to press demands for a greater share of oil revenues and political autonomy, received the tanker on Saturday at the Es Sider port in the volatile east.
The docking and loading of crude escalates a seven-month blockade of key oil ports and is just one facet of deepening turmoil in the OPEC producer, which is struggling to control militias that helped oust Muammar Gaddafi in 2011 but kept their weapons and now challenge state authority.
Prime Minister Ali Zeidan said on Saturday that Libya would bomb the 37,000-tonne tanker if it tried to exit the port, one of Libya's biggest oil export terminals.
State news agency LANA said on Sunday the Defence Ministry had issued orders to the military and warned the tanker's owner.
"The Defence Ministry issued orders to the chief of staff, air force and navy to take care of this tanker which entered Libyan waters without official permission," LANA said, according to a Reuters report.
"The order authorises the use of force and puts the responsibility of any damages resulting from this on the ship owner," it said.
Spokesmen for both the state-run National Oil Corp (NOC) and the rebels said the tanker was still docked at the port.
Local newspaper al-Wasat said the tanker had loaded $36m of crude.
A Reuters reporter who visited Es Sider on Saturday evening said there was only a small force at the gate consisting of around ten cars. The guards had orders not to let staff out until the loading was complete, one of them said.
The rebels are led by former anti-Gaddafi commander Ibrahim Jathran, who used to be in charge of a brigade paid by the state to protect petroleum facilities, but turned against the government and seized the port and two others in the east with thousands of his men in August.
Tripoli has held indirect talks with Jathran, but his demand for a greater share of oil revenues for the eastern region, which it had under Gaddafi's predecessor King Idris, is sensitive because the government worries this might lead to secession.
In January, the Libyan navy fired on a Maltese-flagged tanker that it said tried to load oil from the protesters in Es Sider, successfully chasing it away.
It is very unusual for an oil tanker flagged in secretive North Korea to operate in the Mediterranean, shipping sources said. NOC says the tanker is owned by a Saudi company. It changed ownership in the past few weeks and had previously been called Gulf Glory, according to a shipping source.
Libya's government has tried to end a wave of protests at oil ports and fields that have slashed oil output to 230,000 barrels per day (bpd) from 1.4m bpd in July.
Western powers worry Libya will slide into deeper instability or even break apart.