A man argues with a Libyan rebel fighter (R) after rebels tried to detain one of his workmen (L) near a checkpoint in Tripoli's Qarqarsh district August 22, 2011. Libyan government tanks and snipers put up scattered, last-ditch resistance in Tripoli on Monday after rebels swept into the heart of the capital, cheered on by crowds hailing the end of Muammar Gaddafi's 42 years in power. [Xinhua/Reuters]