Libyan rebels advanced into Tripoli on August 21, 2011 and met little resistance from Gaddafi's defenders. The euphoric fighters celebrated with residents of the capital in the city's main square. EPA / Landov People celebrate the capture of Seif al-Islam, at the rebel-held town of Benghazi, Libya, early Monday, Aug. 22, 2011. Alexandre Meneghini / AP Photo Tens of thousands of Libyans celebrate the arrest of Gaddafi's son Saif al-islam and the partial fall of Tripoli in the hands of the Libyan rebels on August 21, 2011 in Benghazi, Libya. Gianluigi Guercia, AFP / Getty Images Local residents greet advancing rebel fighters on the outskirts of Tripoli, Libya, Monday, Aug. 22, 2011. AP Photo A Libyan rebel celebrates inside the captured military base, "Kilometre 27", base to soldiers loyal to Libyan leader Moamer Kadhafi, 16 kilometers west of the centre of Tripoli, on August 21, 2011, as the rebels said victory in Tripoli was imminent and urged NATO to join the final battle with Apache assault helicopters. Filippo Monteforte / AFP / Getty Images Rebel fighters look towards the enemy as they hear the sound of bombardments in the village of Mayah, some 30 kilometers west from Tripoli, LIbya, Sunday, Aug. 21, 2011. Libyan rebels said they were less than 20 miles (30 kilometers) from Moammar Gadhafi's main stronghold of Tripoli on Sunday, a day after opposition fighters launched their first attack on the capital itself. Fighters said a 600-strong rebel force that set out from Zawiya has reached the outskirts of the village of Jedaim and was coming under heavy fire from regime forces on the eastern side of the town. Sergey Ponomarev / AP Photo A rebel sprays graffiti depicting Col. Moamer Kadhafi on a wall in Gadayem, west of the capital Tripoli, on August 21, 2011. Filippo Monteforte / AFP / Getty Images In this image from video rebel fighters shelter behind a dumpster as they fire on a street in Zawiya, Libya Friday Aug.19 2011 as they battled for control of the strategic central square against forces loyal to Moammar Gadhafi. Rebel forces were reported to have expelled government forces from Zawiya, a coastal city just 30 miles (50 kilometers) west of Tripoli, on Saturday Aug. 20. They also claim to have captured two more towns - Zlitan in the west and Brega in the east. The momentum in the six-month-old Libyan civil war now appears to have firmly swung in the rebels favor after months of near deadlock. (AP Photo/Sky via APTN) Anonymous In this image from video a captured tank bearing a rebel flag fires on a street in Zawiya, Libya Friday Aug.19 2011 as they battled for control of the strategic central square against forces loyal to Moammar Gadhafi. Rebel forces were reported to have expelled government forces from Zawiya, a coastal city just 30 miles (50 kilometers) west of Tripoli, on Saturday Aug. 20. They also claim to have captured two more towns - Zlitan in the west and Brega in the east. The momentum in the six-month-old Libyan civil war now appears to have firmly swung in the rebels favor after months of near deadlock. AP Photo/Sky via APTN Rebel fighters ride along towards Gadayem, west of Tripoli, on August 21, 2011. Explosions and gunfire rocked Tripoli as a months-long uprising pushed through the gates of the Libyan capital, with rebels insisting they are close to toppling Moamer Kadhafi. Filippo Monteforte / AFP / Getty Images Medics treat a pro-Gadhafi fighter in the Abu-Rafat hospital on the outskirts of Zawiya, LIbya, Sunday, Aug. 21, 2011. Sergey Ponomarev / AP Photo People celebrate the recent news of uprising in Tripoli against Moammar Gadhafi's regime, at the rebel-held town of Benghazi, Libya, early Sunday, Aug. 21, 2011. Libyan rebels said they launched their first attack on Tripoli in coordination with NATO late Saturday, and Associated Press reporters heard unusually heavy gunfire and explosions in the capital. The fighting erupted just hours after opposition fighters captured the key city of Zawiya nearby. Alexandre Meneghini / AP Photo