Libya's new leaders have been given the thumbs up by the US assistant secretary of state.<br /><br />Jeffrey Feltman is the first official from the Barack Obama administration to visit post-Gaddafi Libya.<br /><br />Meanwhile, revolutionary fighters continue their struggle against Muammar Gaddafi supporters to seize the last remaining strongholds.<br /><br />Al Jazeera has been told that forces of the National Transitional Council have got to centre of the city but had to pull back.<br /><br />Al Jazeera's Hashem Ahelbarra reports from the Libyan capital.