Attacks comes a few hours after Libyan leader makes his first public appearance since death of son Muammar Gaddafi’s compound in Tripoli has been hit by Nato rockets again, a few hours after the veteran autocrat appeared in public for the first time in almost two weeks. Gaddafi was shown on state television in a traditional brown robe addressing tribal leaders, whom he empowered to speak on behalf of a nation he has ruled with absolute power for almost 42 years. The labyrinthine complex in the heart of the capital was struck at around 3am with five bombs and rockets that appeared to target military installations and bunkers. A giant crater could be seen in the lawn in the middle of the complex, with one of the rockets having hit what appeared to be a bunker . Officials said six people were killed in the attack, including two Libyan reporters who had been interviewing supporters camped out at the scene. “These locations were known to be command and control facilities engaged in co-ordinating attacks against civilian populations in Libya,” said a Nato official speaking from Brussels. Libyan spokesman Moussa Ibrahim said the underground facility was not a bunker, but a sewage network. But following the strike, chanting Gaddafi supporters guarded a stairwell leading to the ruined site, having been told to let no reporters near it. Heat rose from a second smaller crater, where shattered reinforced concrete exposed a cavernous hole beneath. The US defence secretary, Robert Gates, revealed that the US had so far spent $750m (£460m) on the international effort to oust Gaddafi . The US and Nato attacks are taking a toll on Tripoli, where queues for fuel and basic services clutter most roadways. However, support for Gaddafi still appears to be solid. Rebel elements in the capital have not mustered any large offensive and the loyalist army appears to be in control despite nightly attacks