Rebel fighters observe the fighting near the main Moammar Gadhafi compound in Bab Al-Aziziya district in Tripoli, LIbya, Tuesday, Aug. 23, 2011, where some of the heaviest fighting took place. The compound, which has been heavily damaged by NATO airstrikes, has emerged as one of the centers of government resistance since tanks rolled out and began firing at rebels trying to get in.(AP Photo/Sergey Ponomarev)