TRIPOLI (Reuters) - Nato warplanes pounded Tripoli for a second day, raising military pressure on Muammar Gaddafi while diplomatic efforts mounted to force his departure. Six loud explosions rocked Tripoli late on Tuesday within 10 minutes, following powerful strikes 24 hours earlier, including one on Gaddafi's compound, that Libyan officials said killed 19 people and state television blamed on "colonialist crusaders." A NATO official said the alliance hit a vehicle storage bunker, a missile storage and maintenance site and a command- and-control site on the outskirts of Tripoli. Government targets around the Western rebel outpost of Misrata had also been hit. "We were quite active in the past 24 hours and will continue to be so," the official said. "Striking fighting units and people trying to give the orders is having the desired effect." Libyan news agency Jana says NATO hit a telecommunications station in Zlitan overnight, causing "material and human casualties losses" west of Misrata. Foreign Secretary William Hague dismissed fears that Western states were being drawn into an Iraq-style conflict. "It's very different from Iraq because of course in the case of Iraq there were very large numbers of ground forces deployed from Western nations," Hague told BBC Radio on Wednesday.