Gunmen surround the Libyan justice
ministry demanding a ban against those
who worked under the former regime of
ousted leader Gaddafi from holding
senior positions.
"Several armed men in vehicles equipped with anti-aircraft guns surrounded the ministry of justice," spokesman Walid Ben Rabha said.
"They asked the minister and staff present to leave their offices and close the ministry."
An AFP photographer saw more than 20 pick-up trucks loaded with machineguns, anti-aircraft weapons and rocket launchers, saying they had blocked access to the building.
Dozens of gunmen making the same demand have kept the foreign ministry under siege since Sunday, paralysing its work.
The interior ministry and the national television station have also been attacked.
On Monday, angry police officers fired their guns in the air and stormed the interior ministry demanding higher wages.
Prime Minister Ali Zeidan has denounced the encircling of the foreign ministry and other such attacks.
On Sunday, he appealed to Libyans to support the government in resisting armed groups "who want to destabilise the country and terrorise foreigners and embassies," but said the government would "not come into confrontation with anyone".
For its part, the UN mission in the country today urged all Libyans to engage in "constructive dialogue... in such a way as to promote the achievement of the Libyan revolution's goals".
The government is struggling to assert its influence across the country, where former rebels who fought to unseat Muammar Gaddafi in 2011 still control large amounts of territory.
The latest events illustrate a rise in violence in Tripoli, where a car bomb struck the French embassy last week, wounding two French guards and a girl living nearby.
Gunmen have said they will lift their siege when the General National Congress — Libya's highest political authority — adopts a bill calling for the expulsion of former regime employees from top government and political posts.
The bill could affect senior government figures and has roiled the political class.
Under pressure, Congress adjourned until Sunday to allow political blocs to seek consensus.
But some MPs said the real reason was security concerns over a planned demonstration today outside the Congress.