On Saturday, Tunisia's consul in Tripoli, Brahim Rezgui, said 172 Tunisians had been arrested by the Libya Dawn coalition of militias in control of the city.
Differing reasons have been given for the arrests, including immigration issues or retaliation for the arrest of a Libyan in Tunisia.
Foreign Ministry spokesman Mustapha Ziri said today that negotiations about releasing those still held were continuing.
The government has warned Tunisians not to visit Libya unless absolutely necessary.