Allies vow to continue operation until Gaddafis ouster

In a joint article, the British, American and French leaders warned that it would be an unconscionable betrayal if Nato were to cut and run with the dictator still in power.Gaddafi must go and go for good before rebuilding of the country could begin, they said - dismissing calls for an immediate ceasefire.The defiant statement came as warplanes were again heard over Tripoli, accompanied by air raid sirens and loud explosions.Meanwhile, forces loyal to the Libyan leader laid siege to the port of Misrata, shelling the city through the day and killing at least 13 people and injuring 50.Thousands of Gaddfi’s supporters took out a rally in his stronghold Bab Al Azizia. The participants were carrying portraits of Gaddafi and banners with slogans in his favour.