An explosion is seen near Muammar Gadhafi's main compound in the Bab al-Aziziya district in Tripoli, Libya, Tuesday, Aug. 23, 2011. Fresh fighting erupted in Tripoli on Tuesday hours after Moammar Gadhafi's son turned up free to thwart Libyan rebel claims he had been captured, a move that seems to have energized forces still loyal to the embattled regime. (AP Photo/Sergey Ponomarev)