Libyan Rebels March On Tripoli

Residents of Tripoli are fleeing as Libyan rebels move slowly toward the capital city. The battlefront is now about 18 kilometers out of town; there's also heavy, bitter fighting and multiple NATO airstrikes in Zawiyah. Meanwhile, rumors about the fate and location of Moammar Gadhafi and his son are rampant. Guest host John Ydstie gets the latest on the rebel advance from NPR's Lourdes Garcia-Navarro in Libya.