The U.S. mission in Benghazi that came under attack by militants on September 11 was mainly a secret CIA operation, the Wall Street Journal reported Friday, shedding new light on the deadly assault.

President Barack Obama's administration has faced a storm of pre-election questions about why there was not more security at the U.S. consulate where four Americans, including Ambassador Chris Stevens, were killed on September 11.

A dozen demonstrators stormed Libya's national assembly late on Tuesday prompting postponement of a key vote on the cabinet line-up proposed by Prime Minister Ali Zeidan.

Images aired on state television showed angry scenes in the chamber as assembly members prepared to vote one by one on the proposed line-up.

Libya's new Prime Minister Ali Zeidan on Tuesday presented his 30-member cabinet to the national assembly for approval in the hope of forming a coalition government after his predecessor failed.

Zeidan told the General National Congress, in a televised address, that he had included the main political parties in his line-up, among them the liberal National Forces Alliance and the Islamist Justice and Construction Party, while some top posts were given to independents.

Libya's defense minister said Monday that the army has no control over Bani Walid, one of the last bastions of Moammar Gadhafi's regime, and that armed groups there prevent families from returning home.

"The chief of staff has no control over the town and therefore armed men are able to prevent families from coming back," Osama al-Jueili told journalists in Tripoli, adding that "gunmen" hold a checkpoint leading to the town.

A gunman killed during a police raid on an apartment in northern Cairo is suspected of involvement in a deadly attack last month on the U.S. consulate in the Libyan city of Benghazi, police said Thursday.

Various media reports meanwhile suggested that the man who died in Wednesday's raid was a Libyan citizen who is believed to be an Al-Qaida militant.

Libyan pro-government forces on Wednesday seized control of Bani Walid, one of the last bastions of Moammar Gadhafi's ousted regime, an AFP correspondent in the town said.

Hundreds of fighters, mostly former rebels from the rival town of Misrata, converged on the center of Bani Walid, firing in the air to celebrate and hoisting the Libyan flag on abandoned public buildings, he said.

Libya on Tuesday celebrated the first anniversary of its "liberation" from the regime of Moammar Gadhafi, even as fighting flared in a former bastion of the slain dictator.

On October 23, 2011, just three days after Gadhafi was captured and killed in his hometown Sirte, the transitional authorities declared the country's liberation, formally ceasing hostilities.

After days of cramming, two intense earlier debates, and a bitter months-long campaign, Barack Obama and Mitt Romney will come out swinging Monday in their third and final showdown.

With this rematch focusing on foreign policy, the president and his Republican rival will no doubt trade blows over security shortcomings in Libya; how to contain Iran; the roiling crisis in Syria; a rising China; and ending the Afghan war.

Clashes between Libyan pro-government forces and fighters of Bani Walid, a former bastion of slain dictator Moammar Gadhafi, killed nine people on Saturday and wounded more than 100 others, a medical official said.

"The hospital has received nine people killed and 122 wounded," from the fighting, said the medical official in the city of Misrata, northeast of Bani Walid, where pro-government forces are being treated.

Mussa Ibrahim, who served as the last spokesman for deposed Libyan leader Moammar Gadhafi, was arrested on Saturday southwest of the capital, the prime minister's office said.

"Mussa Ibrahim was arrested at a checkpoint in the town of Tarhuna," read a brief statement sent to journalists after rumors that he had been detained spread on social networking sites.