New York Daily News reports that many demonstrators have been killed by machine-gun and anti-aircraft artillery fire, but, with the help of military forces in sympathy with them, have taken Benghazi, the second largest city in Libya. Reuters has more information about this escalating uprising against Muammar Gaddafi.
UPDATE1: The Sydney Morning Herald ran an AFP article describing fighting in the Libyan capital of Tripoli, where the opposition has seized control of some military bases and tanks.
UPDATE2: The Daily Mail (U.K.) says that Gaddafi has fled the capital, and that protesters have torched the parliament building. An Associated Press article says that action is being taken to evacuate foreign workers.
UPDATE3: BBC News reported that Gaddafi appeared on state television to tell the public that he had not skipped the country to seek political asylum in Venezuela and was still in Tripoli. How long he can maintain his grip on power remains to be seen.