Tunisian special forces take position during clashes with militants in the southern town of Ben Guerdane, near the Libyan border, on March 7, 2016. ( AFP)

Tunisian soldiers drive a light gun car during clashes with militants in the southern town of Ben Guerdane, near the Libyan border, on March 7, 2016.(AFP)

Tunisian security forces gather at the scene of an assault on a house outside the town of Ben Guerdane near the border with Libya on March 3, 2016. Five militants who were killed by Tunisian forces near the Libyan border had slipped across with the intention of carrying out "terrorist attacks", Prime Minister Habib Essid said. (AFP)

Tunisian special forces take position during clashes with militants in the southern town of Ben Guerdane, near the Libyan border, on March 7, 2016. (AFP)

Tunisian special forces take position during clashes with militants in the southern town of Ben Guerdane, near the Libyan border, on March 7, 2016. Tunisian forces killed at least 21 jihadists who attacked police and army posts near the Libyan border in a new spillover of violence that also saw four civilians killed (AFP)

Tunisian soldiers stand guard at the scene of an assault on a house outside the town of Ben Guerdane near the border with Libya on March 3, 2016. (AFP )

(FILES) This file photo taken on January 22, 2016 shows young Tunisians raiding and looting a burnt appliance store in Ettadhamen city, west of the capital, Tunis.
(AFP)