Khalifa Soltani was kidnapped yesterday in the Mount Mghilla area, and a security sweep recovered his body after a "terrorist group" announced his abduction, Belhassen Oueslati told AFP.
Oueslati did not provide further details about the victim, but media reports said he was the brother of Mabrouk Soltani, a 16-year-old shepherd who was decapitated on November 13, 2015.
The Tunisian branch of the Islamic State group, Jund al- Khilafa (soldiers of the caliphate), claimed that killing, accusing the boy of betraying their movements to the army.
The interior ministry said on Tuesday the six belonged to "sleeper cells" of Jund al-Khilafa.
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It also said the jihadist killed on Sunday had belonged to the Okba Ibn Nafaa Battalion which is linked to Al-Qaeda, and not to IS as it had previously said.
Since its 2011 revolution, Tunisia has experienced an increase in jihadist attacks that have cost the lives of dozens of members of the security forces and 59 foreign tourists.