TRIPOLI - Explosions rocked central Tripoli for the second night in a row and Britain said weeks of NATO bombardment had inflicted extensive damage on Muammar Gaddafi's heavily-fortified compound.Libya's leader is clinging to power despite a four-month-old NATO air campaign and a lengthening conflict with rebels seeking an end to his 41-year rule and who have seized large swathes of the North African country.The explosions hit Tripoli at about 1 a.m. on Sunday, a day after NATO launched strikes on what it said was a military command site in Tripoli.Major General Nick Pope, the Chief of the Defense Staff's communications officer, said Royal Air Force aircraft struck the high perimeter walls of Gaddafi's Bab al-Aziziyah complex.