At a joint press conference in the capital Tripoli after their meeting, head of NTC's executive board Mahmoud Jibril said the two sides have agreed to form a high-level joint committee on bilateral relations on the new track.

Clinton, who arrived here on October 18 on an unannounced visit, said the committee is welcomed by the United States as it will "look at the priorities of the Libyans themselves have."

Confirming that the two sides are working together to return billions of dollars of frozen assets, Clinton said the first thing to focus on in Libya at the current stage is still security.

Also, Clinton pointed out the importance of unifying the militias under national command. She said members of all militia must "see the benefit of joining the new government."

Meanwhile, Washington will extend economic cooperation with Tripoli, enhance educational and cultural exchanges as well as civil society engagement, said the US secretary of state, who also vowed to send some of the seriously injured in the war to specialized medical facilities in the United States.

But the two sides seem yet to reach consensus on the Lockerbie case, in which a Libyan convict was involved.

Clinton's visit, after the one made by British Foreign Minister William Hague on October 17, came as the Libyan NTC fighters are striving to conclude the siege of remnant pro-Gaddafi forces in their last hideouts in Bani Walid and Sirte.