Libyan National Transitional Council leader Mustafa Abdel Jalil says his forces are in a “position of strength” and can enter any city. However, he says they want to avoid bloodshed.

He commented during a Saturday news conference in Beghazi, where he also said a one-week truce was in effect for Moammar Gadhafi's holdouts. He said now was the time for Gadhafi loyalists in Sirte, Bani Walid and several other locations to peacefully surrender.

Separately, NTC member Ali Tarhouni announced the formation of a supreme security committee that will protect Tripoli.

He said the committee would work to protect the capital's public and private sectors and eliminate remnants of pro-Gadhafi forces.

His announcement, on Saturday, has come on the heels the provisional authority's decision to move its headquarters from Benghazi to Tripoli. NTC officials say the relocation will take place within the next week.

Also Saturday, U.N. envoy Ian Martin arrived in Tripoli on for talks with the NTC on Libya's future.

His visit comes after the provisional authority received a financial boost on Thursday when world leaders pledged $15 billion in monetary and humanitarian support. Foreign diplomats say a second meeting of the so-called “Friends of Libya” group will take place in New York on September 20.

Tarhouni also said Saturday that oil production would resume at two refineries in mid-September.

On Friday, provisional leaders announced that five international energy firms were resuming operations in the country — a critical step in efforts to rebuild an economy wracked by civil unrest and sanctions.