An explosion rocked a Coptic church near the Libyan city of Misrata, killing two people and wounding two, all of them Egyptians, a diplomat told Agence France Presse on Sunday.

"Two men were killed and two others wounded," said the diplomat at the Egyptian embassy in Tripoli who declined to be named, adding that it took place late Saturday but the embassy was only informed on Sunday.

Some 2,000 people rallied in Libya's second city Benghazi on Friday to demand that militias made up of former rebels who helped oust dictator Moammar Gadhafi disband and join the army or police.

"Our demands are: dissolve all militias and make their members individually enter the army or police force," activist and law student Bilal Bettamer said.

The Libyan army is deploying units to help bolster security in the eastern city of Benghazi, a military spokesman said on Friday, a day after clashes there killed four people.

"Army units will secure the entrances and exits of the city as well as strategic sites until security is restored," army spokesman Ali al-Sheikhi told AFP, adding that the decision was in coordination with the interior ministry.

Armed men attacked police headquarters in the Libyan city of Benghazi on Thursday, with five policemen wounded and a nearby resident killed, security and medical officials said.

"An armed group attacked the police headquarters in Benghazi trying to free suspects who were arrested a few days ago," a security official told AFP.

The scandal over the Benghazi attack grew Wednesday as a top State Department official resigned and three others were suspended when a probe uncovered major security failures and mismanagement.

The news came amid a clamor of calls for Secretary of State Hillary Clinton to testify to U.S. lawmakers about the attack on the U.S. consulate in Benghazi, Libya, after ill-health forced her to pull out of this week's hearings.

A long-awaited inquiry into a deadly militant attack on the U.S. mission in the Libyan city of Benghazi late Tuesday slammed State Department security arrangements there as "grossly inadequate."

But the months-long probe also found there had been "no immediate, specific" intelligence of a threat against the mission, which was overrun on September 11 by dozens of heavily armed militants who killed four Americans.

A keenly-awaited inquiry into a deadly militant attack on a U.S. mission in Libya has been completed and U.S. Secretary of State Hillary Clinton is reviewing it, a top official said Monday.

The findings of the Accountability Review Board set up by Clinton just days after the September 11 attack on the U.S. consulate in Benghazi could unleash a Christmas bombshell for the U.S. administration.

Two explosions rocked police stations in the Libyan city of Benghazi early on Monday and police foiled a third attack, a security official told Agence France Presse, adding that there were no casualties.

Police in the eastern city had placed checkpoints and bolstered security around their stations following two Sunday attacks, blamed on radical Islamists, which claimed the lives of four officers, an AFP correspondent said.

Libya ordered the closure of its borders with four of its neighbors on Sunday, as it declared the desert south of its territory a closed military zone in the face of mounting unrest, state media reported.

The National Assembly ordered the "temporary closure of the land borders with Chad, Niger, Sudan and Algeria pending new regulations" on the circulation of people and goods, said a decree carried by the official LANA news agency.

Armed men killed four policemen and two soldiers Sunday in separate attacks in Libya, including one in a former bastion of Moammar Gadhafi's regime that was toppled last year, security officials said.

Assailants using small arms and rocket-propelled-grenades attacked two police stations in the eastern city of Benghazi -- the epicenter of the anti-Gadhafi uprising -- after the arrest of a suspect for his alleged role in several assassinations of police and military officers, an official said.