State television in Tunisia has reported that all ministers in the interim government have resigned from the party of former president Zine al-Abidine Ben Ali, who was ousted last week.
But the broadcast said the ministers would retain their seats in the cabinet, which held its first meeting on Thursday.
The new government says it will recognise all banned political groups and grant an amnesty to all political prisoners.
Three days of mourning was also declared for dozens of people killed during the unrest.
Earlier, it was announced the interim authorities had arrested more than 30 members of Mr Ben Ali's family.
Mr Ben Ali fled to Saudi Arabia last Friday after weeks of protests over poverty and unemployment. The BBC reports that protests have continued, despite his departure.
It was not clear which members of the family are in custody.
However, state television showed what it said was gold and jewellery seized during raids on their properties.
An official statement said those being held were suspected of crimes against Tunisia.
A state of emergency is still in place and the army is still deployed in the capital Tunis. Schools and universities remain closed.
The interim government has pledged free and fair elections within six months but has given no dates.
Under the Tunisian constitution, a new presidential election should be held within two months of Mr Ben Ali's departure.
Missing gold
The World Gold Council says Tunisia's state coffers are missing 1.5 tonnes of gold, worth 45 million euros ($A60.66 million).
There have been reports that Mr Ben Ali and his wife collected the ingots before fleeing the country.
The World Gold Council says Tunisia had 6.8 tonnes of gold in December.
The central bank in Tunis this week said it held about 5.3 tonnes, but dismissed reports that the family of the ex-leader had withdrawn the gold.
However, French daily Le Monde and TV TF1 report that the gold was withdrawn in late December.
