TRIPOLI, Libya (AP) -- Libya's ousted prime minister fled to Europe after parliament voted him out, leaving behind a country that risks being torn apart as the fault line between its eastern and western regions broke open Wednesday to a degree unseen since the 2011 civil war that ousted longtime strongman Moammar Gadhafi.
A western-based militia fighting in the name of parliament has launched an offensive against an autonomy-minded militia in the east that has for months occupied most of Libya's crucial oil facilities -- seizing virtual control of the country's most vital resource and almost sole source of cash. This past week, it succeeded in exporting a tanker of oil from a port it holds in defiance of the central government.
In response to the offensive other militias in the east are rallying to fight back. Eastern leaders have warned that unless Tripoli backs down they will seek outright independence for their region rather than greater autonomy.
Since Gadhafi's fall, Libya has been torn among multiple, rival, heavily armed militias affiliated to regions, cities and tribes, while the central government has been weak, unable to bring its authority over the country, inheriting Gadhafi-era military and police forces in disarray. Furthermore, militias have lined up on rival sides of a political struggle between Islamist politicians and their opponents.
Now the success by the Islamist-leaning parliament in voting out secular figure Ali Zidan as prime minister on Tuesday has sparked fears among their opponents of a power grab by the Islamists -- tensions that also could translate into militia clashes. After the vote, Islamist-allied militias demanded rival militias leave the capital, Tripoli. Instead, some anti-Islamist militias beefed up their positions in the city with armored vehicles mounted with heavy machine guns and anti-aircraft guns.
The Islamist parliament chief, Nouri Abu Sahmein, who had mandated the powerful militia from the western city of Misrata to launch its offensive to win back control of the oil facilities, appeared on Wednesday to be trying to pull back from an outright conflict with the east. In a statement, he said parliament had agreed to give the eastern militia, known as the Cyrenaica Defense Force, two weeks to end its occupation of the oil facilities.
Still, the Cyrenaica Defense Force has already repeatedly refused to withdraw from the ports, and there are concerns the tensions are moving out of control.
"We fear falling into a sea of darkness," former Interior Minister Ashour Shway told The Associated Press, denouncing the decision to launch the offensive against the eastern militia.
Shway warned that the armed build-up on both sides could lead inexorably to conflict. "The drums of war are now banging," he said, speaking from Benghazi, the country's second largest city and the heart of the eastern region. "We need sane people to take the lead and stop this from happening."
The eastern half of Libya -- where most of its oil resources are located -- has long complained of discrimination by Tripoli, saying Gadhafi's government starved it of resources during his 42-year rule. In 2012, a group of politicians, activists and some powerful tribes backed by militias declared autonomy for the region, which is historically called Cyrenaica or, in Arabic, Barqa. Last year, they set up an administration and demand the country set up a federal system that would enshrine considerable self-rule powers for the regions and ensure a fairer sharing of resources.
The Cyrenaica Defense Forces militia, led by a commander named Ibrahim Jedran, seized the eastern oil facilities last year, virtually shutting down exports. That has made him a hero for some in the autonomy movement, though some in the east rejected his use of force in the move.
The crisis escalated over the past week, when Jedran's fighters loaded a North Korean-flagged tanker with oil at one of the Mediterranean ports they control, al-Sidra to export. Forces from the rival Misrata militia vowed to stop the tanker, and at one point, Tripoli authorities claimed to have recaptured the vessel.
But on Wednesday, Culture Minister al-Habib al-Ameen admitted at a press conference that the tanker had managed to escape Libyan waters. It is not known who the militia is selling to oil to.
Throughout the days-long standoff over the tanker, Prime Minister Zidan had appeared helpless, acknowledging to reporters that the military was not obeying his orders and complaining that "everyone is working against the government." Zidan was the country's first democratically chosen prime minister since Gadhafi's fall and had been backed by the United States and other Western powers.