Last Updated 5:46 p.m. ET
TRIPOLI, Libya Rebels hammered at least 10 buildings at Muammar Qaddafi's compound sheltering loyalist fighters today. As anti-aircraft guns battered the buildings, there were huge explosions, and the air was clogged with smoke. At least three of the buildings were burning.
One rebel involved in the battle, Mohammed Karami, said Qaddafi loyalists had "heavy weaponry, maybe even a tank."
CBS News correspondent Barry Petersen, reporting from about a kilometer away, said the area has been contested for several days. "There's sniper fire around the area, it's hard to get in ... We're told there are some bodies on the street," Petersen said.
"These are entrenched fighters, with snipers on the rooftops," in areas filled with industrial and government buildings, said Popyk. "So it's very, very hard to do anything except go in there and attack."
Petersen also said there were rumors circulating among the rebels that Qaddafi or one of his sons may be holed up inside.
Government spokesman Moussa Ibrahim told the Associated Press that Qaddafi is safe, healthy and his morale is high.
Ibrahim said Thursday in a telephone call that Qaddafi "is indeed leading the battle for our freedom and independence every day," though he refused to say where in Libya the embattled leader was, other than that he was in an undisclosed location within the country and constantly on the move.
An intense gun battle erupted outside the Corinthia hotel where many foreign journalists are staying, as about a dozen rebels with machine guns and an anti-aircraft gun fired on what appeared to be loyalist gunmen shooting from nearby high-rise buildings.
Popyk said rebel fighters are trying to force Qaddafi loyalist troops out of their hiding places: "There was gunfire, young rebel fighters firing at a construction site right beside the hotel here," he said, "a lot of places in that construction site for any Qaddafi forces to hide."
In other developments:
- A Libyan rebel Cabinet minister says the leadership is immediately moving to Tripoli from Benghazi.
- Al Arabiya is reporting two aircraft at Tripoli's airport have been set ablaze by mortar fire from Qaddafi fighters.
- The rebel leadership has offered
An audio message by Muammar Qaddafi was broadcast on local TV, in which he called on Libyans to "liberate" the capital. "Don't leave Tripoli to those rates," he said. "Seize the tall buildings, rooftops ... Let the masses crawl from everywhere now towards Tripoli, forwards, forwards.".
- Al Arabiya quotes an eyewitness saying Saif al-Islam Qaddafi was spotted driving around Tripoli in an armored SUV accompanied by guards.
- British Defense Secretary Liam Fox told BBC Radio 4 Thursday that NATO was helping in the search for the longtime dictator, "providing intelligence and reconnaissance assets to help in the hunt," and had been heavily active in carrying out overnight airstrikes against Qaddafi loyalists. Fox refused to say if British special forces were involved. In Brussels, a NATO official said some airstrikes were launched because Qaddafi's forces had been detected trying to restore some of their damaged weapons systems, including surface-to-air missiles, which the official called a "huge threat" to alliance aircraft and humanitarian aid flights.
The rebels are struggling to take complete control of Tripoli, four days after they swept into the capital and sparked the collapse of Qaddafi's regime.
The autocrat has refused to surrender and has vowed from hiding to fight on "until victory or martyrdom."
Rebels say one of their key targets now is Qaddafi's hometown of Sirte, about 250 miles from Tripoli, but acknowledged that capturing that city would not be easy because Qaddafi's fellow tribesmen were expected to put up a fierce fight. Opposition leaders have said they were trying to negotiate a peaceful surrender of the city.
Fawzi Abu Ketf, deputy defense minister of the rebel National Transitional Council, said fighting was raging Thursday outside Bin Jawad, 400 miles south of Tripoli, but he had no details. Qaddafi loyalists ambushed rebels advancing toward the city on Wednesday, killing at least 20 of them.
Wednesday's attack was carried out by pro-Qaddafi forces who had retreated from the oil city of Ras Lanouf after rebels captured that city earlier this week, said Ahmed Zeleity, a rebel commander.
The ambush showed that pro-regime forces retain the ability to strike back even as the rebels tighten their control over the nation's capital.
Rebels also have seized several parts of Sebha, another Qaddafi stronghold still holding out, including the main commercial Gamal Abdel-Nasser street, according to rebel official Adel al-Zintani, who is in daily telephone contact with rebel commanders in the desert city.
He said mercenaries from sub-Saharan African nations who had been paid by Qaddafi have fled the city, but loyal soldiers were continuing to hold firm.
Ketf said another challenge was the need to supply troops at the front. "The supply lines will be too long and we are short of funds and supplies," he said.
The humanitarian situation there is increasingly difficult, he said, with lengthy power and water outages.
In Milan, Italian Premier Silvio Berlusconi said Italy was preparing to release $505 million in frozen assets in Italian banks, calling it the first payment. Italy, Libya's former colonial ruler and biggest trading partner, has not disclosed the total Libyan assets held there.
Berlusconi made the announcement after meeting with the leader of Libya's rebel Cabinet, the second stop on a European diplomatic tour by Mahmoud Jibril aimed at securing the release of billions of dollars in frozen Libyan assets.
The Libyan opposition says they urgently need at least $5 billion of those assets to pay state salaries, maintain vital services and repair critical oil facilities.
The U.N. Security Council, meanwhile, is preparing to vote this week on a resolution that would release $1.5 billion in Libyan assets in U.S. banks that the world body froze to thwart Qaddafi. Analysts estimate as much as $110 billion is frozen in banks worldwide.
Reflecting the continuing unrest in parts of Libya, a Maltese ship sent to evacuate foreigners from Tripoli turned back Thursday after fighting in the Libyan capital made the operation too risky.
The vessel was to evacuate at least 24 foreigners trapped in the Libyan capital, but the Maltese government said the mission was aborted Thursday after it became impossible for people to reach the harbor due to fighting in the capital.
The Geneva-based group the International Organization for Migration, however, said a ship chartered to rescue hundreds of foreigners in Tripoli had managed to dock there, after waiting offshore for days due to fighting.
The group is "very optimistic that we will be able to carry out the evacuation today," spokeswoman Jemini Pandya said.
In more positive news, four Italian journalists taken at gunpoint in Libya were freed Thursday in a raid on the house where they were being held, an official said.
Details of the raid, first reported on Corriere della Sera's website, and who conducted it were not immediately available. The Italian Foreign Ministry confirmed that the four were freed, but had no further details.
The four were taken at gunpoint Wednesday by forces loyal to the regime of fugitive Libyan dictator, Muammar Qaddafi. Their Libyan driver was killed.
"They shot the driver dead in front of us. We are fine, but our thoughts are with the driver who died. We have become close friends with him," Claudio Monici of Avvenire, the daily of the Italian bishops conference, told reporters in Tripoli after their release.
The others released include two correspondents from the Milan daily Corriere della Sera and one from Turin's La Stampa.
Reporter Tom Popyk told CBS News Radio said Tripoli is a study in contrasts, with calm for much of the day: "Part of this is Ramadan, part of it is fear," he told CBS News. "This is almost a Mediterranean paradise: the sun is shining, the sea is blue.
"You wouldn't guess that in a lot of cases is a city under civil war right now until really you star hearing the echoes of gunfire as the battles rage through some of these neighborhoods."