NATO launches airstrike on Libyan capital

NATO warplanes launched a new round of airstrikes in Tripoli, the Libyan capital, witnesses said.<br /><br />They told Al Jazeera the attacks targeted several sites, including Muammar Gaddafi's compound.<br /><br />Earlier, the United Nations humanitarian chief called for a break in fighting to allow medical aid into the country.<br /><br />Al Jazeera's Monica Villamizar reports.