The attack comes as Tunisia prepares for what it hopes will be a surge in tourism after a spate of jihadist attacks in 2015 sent visitor numbers plunging.
A large procession led by members of the armed forces accompanied the body of guardsman Arbi Guizeni through the Tunis suburb of Douar Hicher.
The six national guard members were killed, and three others wounded, when their cars were attacked yesterday morning with an improvised explosive device in the Ain Sultan area of the Jendouba border province.
He said search operations launched Sunday were continuing but no arrests had been made.
Okba Ibn Nafaa, a Tunisia-based division of Al-Qaeda in the Islamic Maghreb (AQIM), late yesterday claimed responsibility for the attack and said it had killed nine soldiers, according to the SITE Intelligence Group that monitors jihadist activity online.
Okba Ibn Nafaa and the Tunisian branch of the Islamic State group, Jund al-Khilafa (Soldiers of the Caliphate), are active in the mountainous border region where the attack took place.
That attack killed 13 security forces and seven civilians.
Tunisia's tourism industry is still rebounding from a string of devastating attacks in 2015, including one at the National Bardo museum in Tunis and another targeting a beach resort in Sousse that together killed 59 foreign tourists and a Tunisian guard.
Since the 2011 uprising that toppled dictator Zine El Abidine Ben Ali, jihadist attacks in Tunisia have killed dozens of members of the security forces and foreign tourists.
The country has been under a state of emergency since November 2015, when an IS-claimed suicide bombing in Tunis killed 12 presidential guards.
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