A Tunisian customs officer was killed on Sunday evening and others were injured in an armed attack on a Tunisian-Algerian border patrol in Kasserine Governorate on the country's western border with Algeria, state television and the president of a union of border guards said.
"A border guard was killed and three others were wounded in a shootout with a terrorist group in Bouchebka," Wataniya 1 television reported.
Ridha Ennasri, the union's president, confirmed to Agence France-Presse that a border guard was killed in "a terrorist attack" and said that another was wounded.
Three Tunisian customs officers were transported to a local hospital in Kasserine, two of them in critical condition.
Police forces believe the attackers belonged to an armed group called "Okba Ibn Nafaa Brigades," which is designated as a terrorist group by the Tunisian government. The group previously killed a Tunisian National Guard officer last December
The Okba battalion launches attacks on security and military personnel, calling them "tyrants," and incites the killing and targeting of troops. It plants conventional mines in the mountains of Kasserine to prevent advances by Tunisia's security forces and army.
Sunday’s border attack comes days after a Tunisian policeman was shot dead by two assailants on a motorbike in the coastal resort of Sousse.
Sousse witnessed a gruesome attack claimed by ISIS last June in which 38 foreign tourists were shot dead on a beach.
Since the end of 2012 dozens of Tunisian security and military personnel have died in mine explosions and ambushes attributed mostly by the authorities to the "Okba battalion."