The death toll from yesterday's clashes in the city of Ben Guerdane rose to 55, including 36 attackers, Essid said today.
Seven civilians and 12 members of Tunisia's security forces also died, and 17 others were injured.
"The attack that happened yesterday showed that our military and security forces were ready," he told a press conference. "We won a battle, but we haven't yet won the war on terror, and that war continues."
No group immediately claimed responsibility for the attack, but websites affiliated with the Islamic State group said IS militants were handed a tough blow by Tunisian security forces.
Only four out of the 36 attackers killed have been formerly identified. Essid did not give more details about the attackers' background but said some came from Libya.
According to local journalist Raoudha Bouttar, there was sporadic gunfire on Tuesday in the outskirts of Ben Guerdane as Tunisian forces searched for attackers still at large.
Tunisian forces have repeatedly clashed with extremists on the borders of Libya and Algeria in recent years, but yesterday's fighting was unusually bloody.
An uprising in neighboring Libya led to the ouster and killing of longtime autocrat Moammar Gadhafi in 2011, but since then the country has fallen into chaos, allowing the Islamic State group to take control of several cities.
The divided country is ruled by two parliaments: an internationally recognized body based in the eastern city of Tobruk and a rival government, backed by Islamist-allied militias, that controls the capital, Tripoli.
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