At least 13 people have died after an explosion hit a bus carrying presidential guards
Tunisia’s president Beji Caid Essebsi has since declared a 30-day state of emergency and the capital is under curfew.
No group has yet said it was behind the attack.
The explosion happened at a bus stop where the presidential guard picks up and drops off its staff, near the former headquarters of the party of deposed President Zine El-Abidine Ben Ali.
Tunisia has been targeted by the Islamic State (IS) group, including an attack by a gunman on the beach resort of Sousse in June, killing 38 people.
The North African state is believed to be the biggest exporter of jihadists, with the authorities saying at least 3 000 of its nationals are fighting in Iraq and Syria.
