A three-storey building in a military command centre used by Muammar Gaddafi has been destroyed in an air strike by coalition forces. The Sunday-night strike was the first reported attack on the Bab al-Azizia, a sprawling compound in the Libyan capital, Tripoli, that Gaddafi has used several times as a setting for televised addresses, and which was bombed by the United States in 1986.