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Explosions have been heard near the Libyan leader's compound as the fight for Tripoli rages for a third day. But no one seems to know where Colonel Gaddafi is. And heavy clashes between the rebels and government forces have been reported in central parts of Tripoli including around a hospital. Latest footage from the capital shows explosions possibly caused by NATO bombing raids. Casualties are said to be mounting after intense fighting overnight, although electricity in Tripoli has been restored after hours of blackout.