Key Libyan city falls to Gadhafi foes as clashes reported in Tripoli

CAIRO, Egypt—Libya's second largest city, Benghazi, fell Sunday after a crack army unit defected to the opposition and clashes spread to the capital, Tripoli, as an uprising against Moammar Gadhafi appeared to threaten the Middle East's longest ruling dictator's 42-year grip on power, residents and news reports said