BAIDA, LIBYA - Forces loyal to Moammar Gaddafi fought Thursday to take back territory from a popular revolt that is steadily advancing toward the capital, as the United States and other Western powers considered possible responses to the bloodshed including a military "no-fly zone." Loyalist forces made up of Libyan militiamen and foreign mercenaries attacked rebels in two cities near the capital, but the anti-government movement made new gains and seized control of an air force base, news agencies reported. The fighting came as Gaddafi blamed the revolt in his country on Osama bin Laden, in what came across as...