They include the interim head of Ennahda, Mondher Ounissi.

His detention is said to be linked to audio messages in which he purportedly accuses party colleagues of receiving illegal funds.

Mr Ounissi says the recordings are fabricated.

The Tunisian authorities have detained a series of opposition figures this year.

President Kais Saied has ruled by decree since 2021, when he sacked parliament and dissolved the government.

His critics accuse him of carrying out a coup.