A national guard chief and three extremists have been killed in a clash near the Algerian border, Tunisian news reports said Monday.
According to the reports, national guard officers opened fire on an extremist group trying to cross the region of Kasserine from the Kef mountains.
Citing local sources, the reports said the security operation is ongoing near the town of Hidra.
The clash came on the day Tunisia's presidential campaign is officially opening.
The elections are set to be held on September 15.