In Libya, unrest showed no signs of easing. Pro Gaddafi troops reclaimed rebel-held Zawiyah and pounded other opposition positions. Al-Jazeera reported that tanks rolled into Zawiyah, 50 kms from Tripoli, after days of pitched battle between the loyalists and rebels, which according to residents have reduced large parts of the town to rubbles with unclaimed bodies strewn all over. A medical coordinator told reporters at least 400 people have killed and 2,000 been wounded in eastern Libya since the uprising broke out against Moammar Gaddafi. A top Libyan envoy to the United Nations made a new call for world powers to impose a no-fly zone against Gaddafi’s regime. But Muammar Gaddafi warned that any move to clamp a 'no-fly' zone would be strongly resisted by his forces. Ignoring the ultimatum by the rebels asking him to step down within 72 hours, Gaddafi, in an interview to Turkish TV, said a no-fly zone would show the true intention of the Americans and their European allies to “colonise Libya and seize its oil wealth”. There have been signs of diplomatic initiatives on the part of the Libyan leader, Col. Gaddafi. A Libyan Government official has met the Portuguese Foreign Minister in Lisbon at Libya's request. Portugal is a non-permanent member of the UN Security Council and chairs the sanctions committee on Libya. The same official earlier met Malta's Prime Minister. Libyan State Television has offered a reward of almost half a million dollars for the capture of the leader of the transitional National Council, the body set up by the opponents of Col. Gaddafi in the city of Benghazi. The leader of the Council, Mustafa Abdul Jalil was a Minister in the Libyan Government before he joined the rebels. Meanwhile, three members of a BBC Arabic TV team have given graphic accounts of how they were arrested, blind-folded, handcuffed and beaten by Government forces while reporting on conflict in Libya. They were held in blood-stained cells where they heard other people screaming in adjacent rooms. After being detained at an army roadblock, the three men were taken to barracks in Tripoli. Released after 21 hours in detention, all the three later said they feared for their lives. BBC has protested to Libya. A senior Libyan official has apologised for their treatment at the hands of the army. The three have left the country. Meanwhile, NATO spy planes today mounted a 24-hour air space surveillance over Libya, as British Defence Secretary Liam Fox hinted that a no-fly zone could be enforced without wiping the North African nation's air defences. Three Boeing E-3 Sentry aircraft are airborne over the Mediterranean off the Libyan coast keeping track of all Libyan fighters. NATO officials said in London that the surveillance was put into operation around noon today and came as Libyan air force fighters carried out the heaviest bombing of rebel positions at Ras Lanuf in the east and captured the key western city of Zawiyah, 50-km from the capital Tripoli. In growing signs that a US and NATO combine military action may be imminent, the British Defence Secretary said that a no-fly zone over Libya was possible without hitting at Libyan air force bases and air defence systems.