Tunisia has imposed a travel ban on all people involved in corruption cases as well as relatives and advisers of ousted leader Zine al-Abidine Ben Ali, the state TAP news agency said on Friday, citing a judicial source.

"All persons involved in corruption cases and relatives to the ousted president, ministers and advisers are banned from travelling, pending decisions to be taken thereon by the examining magistrate," TAP said on Friday.

It gave no further details. Justice ministry officials were not immediately reachable for comment.

Ben Ali was toppled by mass protests on 14 January after 23 years in power and fled to Saudi Arabia. Seeking to assert their authority and gain legitimacy in the eyes of protesters who forced Ben Ali to flee, the caretaker authorities are attacking the vestiges of his rule.

Tunisia's interim authorities appointed a new government on 7 March and disbanded the state security apparatus, notorious for human rights abuses under Ben Ali.

Last month, the interim government said it would freeze assets of 112 people close to the ousted president pending the completion of judicial investigations.