The Tunisians were arrested off Djerba Island in Tunisia on Wednesday, according to a statement on the National Guard's Facebook page.
The statement did not provide further details on the time of the arrest, Xinhua news agency reported.
It also noted that a sum of foreign currency was seized, and those arrested were referred to the relevant authorities for necessary legal procedures.
Tunisia, located in the central Mediterranean, remains a major transit point for illegal immigration to Europe.