In Tripoli's Martyrs' Square, Khalifa, his wife and three daughters waved Libya's flag as a crowd celebrated five years since the start of the revolution that toppled Moammar Gadhafi, despite the country's continued chaos.

"We love this revolution and we love this freedom! We were slaves to Gadhafi's regime for 42 years," he said, his daughters beside him wearing red, black and green hats.

Libya's internationally recognized parliament decided Tuesday to postpone for seven days a vote on a government of national unity despite growing international concern over jihadist expansion.

"One hundred and eighteen members of parliament met today and decided to give the government chief until Saturday to present his cabinet line-up" to MPs, parliamentarian Aicha al-Aqouri told AFP.

Tunisia said Friday that it was asking its regional authorities to work on a plan to cope with the fallout of a possible foreign military intervention in neighboring war-torn Libya.

In 2011, hundreds of thousands of people fled from Libya to Tunisia -- a country of around 11 million -- to escape fighting that led to the fall of longtime dictator Moammar Gadhafi.

Efforts to hammer out a Libyan unity government are stumbling over the defense portfolio, an official said Wednesday, as the internationally recognized parliament set a new deadline for a line-up.

Libya has been in chaos since the 2011 ouster of longtime dictator Moammar Gadhafi, with two rival administrations and armed groups fighting for control of the oil-rich country.

Libya's presidential council said Monday it needs one more week to form a national unity government, after the country's internationally recognized parliament rejected an initial line-up.

The council, chaired by prime minister-designate Fayez al-Sarraj, had been due to submit the name of a new unity government on Wednesday for approval by the recognized parliament.

Public beheadings and roving jihadist gangs are terrifying residents in the Islamic State group's Libyan stronghold of Sirte, in an ominous sign of the movement's growing international influence.

Witnesses tell of amputations and executions in squares in Moammar Gadhafi's hometown on the Mediterranean coast, where women can no longer go out without a male guardian.

Nigerian President Muhammadu Buhari urged the international community on Wednesday to help end the turmoil in Libya, warning that it was creating a "strategic time bomb" for Africa and Europe.

In a speech to the European Parliament, Buhari said the situation in lawless southern Libya was particularly alarming as it was creating a flow of arms affecting Nigeria and other countries.

The United States and Italy warned Tuesday that the Islamic State (IS) group is expanding its reach, threatening to seize Libya and launch attacks in Western countries.

But as representatives from the 23 countries of the U.S.-led coalition battling the jihadists' self-declared "caliphate" reviewed their progress at talks in Rome, Italy and France made it clear military action against IS's Libyan wing is not on the immediate agenda.

U.N. envoy Martin Kobler on Monday urged the speedy formation of a Libyan national unity government and said it should be installed in the capital Tripoli, Algerian state media reported.

Kobler said the turmoil that has wracked Libya since the 2011 revolution that toppled dictator Moammar Gadhafi had created a "political and military vacuum" and helped the spread of the Islamic State group, the APS news agency said.

U.S. President Barack Obama has asked key advisors to draw up options for ratcheting up the fight against the Islamic State group, including opening a new front in Libya.

Eighteen months after a U.S.-led coalition began airstrikes against IS in Iraq and Syria, multiple administration sources said Friday that the White House wants to speed up and broaden the effort.