Libya has already gathered "considerable' evidence to prosecute the son of slain Libyan leader Moammar Gadhafi for crimes against humanity, a lawyer told the International Criminal Court on Tuesday.

The domestic investigation "has already produced considerable results," Philippe Sands said at a two-day hearing to decide where Seif al-Islam should face justice.

Mitt Romney will call for a U.S. change of course in the Middle East on Monday, saying President Barack Obama's muddled strategy has failed to confront the challenges of extremism.

The Republican White House hopeful, offering a foreign policy vision that he and his campaign believe differs sharply from Obama's, said he would keep Iran in check, chase terrorists in Libya, put conditions on U.S. aid to Egypt and help arm Syrian rebels.

The General National Congress on Sunday rejected a 10-member "crisis government" proposed by Libya's Prime Minister Mustafa Abu Shagur and dismissed him, the presidency said.

One hundred and twenty-five members in the 200-seat GNC did not express "confidence" in the list, against 44 members for and 17 abstentions, according to a live transmission on state television.

A group of seven Iranian Red Crescent workers who were kidnapped in Libya's eastern city of Benghazi were freed on Sunday, an interior ministry official told Agence France Presse.

"The seven Iranians were freed today and have left the country," said Ezzedine al-Fazzani, a spokesman for the interior ministry in the east.

Libya's national assembly rejected on Thursday the government line-up put forward by new Prime Minister Mustafa Abu Shagur after protesters stormed its headquarters, a representative told AFP.

"We voted to reject the government proposed by Abu Shagur and to grant him until Sunday to present a new line-up," said Abdelali al-Dersi, who represents the eastern town of Al-Bayda in the assembly.

More than 100 angry Libyans stormed the General National Congress on Thursday, protesting over the lack of representation of a western town in a proposed new cabinet line-up.

The demonstrators, who were unarmed, barged their way into the GNC to air their grievances to representatives of the legislative assembly, the first elected authority after four decades under slain strongman Moammar Gadhafi, witnesses said.

A team of U.S. investigators visited Libya's second city Benghazi on Thursday to examine the site where Ambassador Chris Stevens and three other Americans were killed in an attack last month.

"An American investigative committee visited the site where the U.S. ambassador was killed," a defense ministry official in Benghazi told Agence France Presse, confirming that the team included FBI agents.

The U.S. military and intelligence agencies are compiling detailed dossiers on those believed to have attacked the U.S. consulate in Libya ahead of possible retaliation, the New York Times reported.

Citing U.S. officials, the Times reported late Tuesday that the top-secret Joint Special Operations Command (JSOC) was collecting information on the deadly attack last month that killed a U.S. ambassador and three other Americans.

One person was killed and five others wounded during clashes near Bani Walid, a final bastion of supporters of slain Libyan leader Moammar Gadhafi, local leaders said Tuesday, warning of looming disaster.

"A resident of Bani Walid was killed in combat against armed groups from the city Misrata," Bani Walid spokesman Massud al-Waer told AFP.

Senator John McCain joined other top Republicans on Sunday in attacking Washington's shifting explanations of the September 11 assault that killed the U.S. ambassador to Libya.

McCain, interviewed on CNN's "State of the Union" show, hinted at "certain political overtones" in the initial claim by President Barack Obama's administration that the assault was part of a spontaneous anti-American demonstration.