It looks like Libyan rebels are closing in for the kill: Reuters reports heavy gunfire and explosions in Tripoli. Rebels have made swift progress this week knocking off strategic cities around the capital, and now it, too, looks in danger of falling. Residents tell the news agency that people are in the streets in some areas shouting anti-Gadhafi slogans. A government spokesman, however, took to state television to downplay the unrest: "All of Tripoli is safe and stable."
Even if that's true, it probably won't be for long, a US assistant secretary of state tells the New York Times. “It is clear that the situation is moving against Gadhafi," says Jeffrey D. Feltman. "The opposition continues to make substantial gains on the ground while his forces grow weaker.” Already, rumors are circulating that Gadhafi himself has fled Tripoli, reports NBC News, but there's no confirmation. Earlier reports had him poised to leave for Tunisia. (Read more Moammar Gadhafi stories.)