Lebanese Forces leader Samir Geagea urged on Tuesday Libya to resolve the mystery of the disappearance of Imam Moussa al-Sadr and his companions, said the LF media department in a statement.

It added: “An issue of this gravity cannot but be a priority for us and the liberated Libyan people.”

Rebel fighters captured Moammar Gadhafi's heavily fortified Bab al-Aziziya compound and headquarters in Tripoli on Tuesday after a day of fierce fighting, an Agence France Presse correspondent witnessed.

The defenders had fled, and the whereabouts of Gadhafi or his family were unknown after the insurgents breached the defenses as part of a massive assault that began in the morning.

The International Criminal Court (ICC) "never" had confirmation of the arrest of Seif al-Islam, one of Libyan leader Moammar Gadhafi's sons said to have been captured by the rebels, a spokesman said Tuesday.

"After yesterday's announcement, we communicated with the National Transitional Council to have confirmation of the arrest, but we never received it from the NTC," the ICC's spokesman Fadi el-Abdallah said -- after Seif al-Islam spoke to journalists to refute the "lies" about his capture.

Turkish Foreign Minister Ahmet Davutoglu arrived in the eastern Libyan city of Benghazi on Tuesday to meet rebel governing council chief Mustafa Abdel Jalil, an Agence France Presse journalist said.

Davutoglu arrived Tuesday morning in the rebel bastion, even as Moammar Gadhafi's forces staged a fightback in Tripoli against insurgents who had surged into the capital on Sunday.

Former Croatian president Stipe Mesic who has close ties Moammar Gadhafi said Tuesday that the Libyan leader told him he was ready to step down from political life if NATO ended airstrikes.

"I can confirm that colonel Gadhafi is ready to retreat completely from political and public life with a firm engagement that we would impede the setting up of a multi-party system but on the condition that the NATO airstrikes cease," Mesic said in a statement quoted by Hina news agency.

Tripoli is "under control" of the regime, a son of Libyan strongman Moammar Gadhafi claimed early Tuesday, after rebels said they had taken most of the capital and gunfire rattled the port city.

Seif al-Islam, wanted by the International Criminal Court for crimes against humanity, met with an Agence France Presse correspondent and two other journalists, after ICC prosecutor Luis Moreno-Ocampo said rebel forces had arrested him.

The Pentagon believes Libya's Moammar Gadhafi has not fled the country, a military spokesman said Monday, as rebel forces swept into the Libyan capital.

It's "probably fair to say that we believe he's still in the country," spokesman Colonel Dave Lapan told reporters.

Syrian President Bashar al-Assad must step down because he is as "irrelevant" to the future of his country as Moammar Gadhafi is in Libya, Britain's deputy prime minister said Monday.

With Gadhafi's regime apparently in its final throes as rebel fighters move into Tripoli, Nick Clegg said the situation in Syria was "less encouraging".

Hizbullah on Monday hailed the "huge victory" of rebels who took control of most of the Libyan capital in their fight against Moammar Gadhafi's rule.

"Hizbullah congratulates the Libyan people and their revolutionaries for this huge victory against the tyrant (Gadhafi) after a long struggle and great sacrifice," Hizbullah said in a statement.

Libyan insurgents on Monday seized control of the state broadcaster in the capital Tripoli, rebel military spokesman Mohammed Zawiwa told Agence France Presse.

"All the television stations controlled by the state have stopped transmitting (in Tripoli). Our fighters have gone in and taken control of the facilities," Zawiwa said.