At least 11 people were killed on Tuesday after an explosion hit a bus carrying Tunisian presidential guards along a major street in the centre of the capital Tunis.
Security and presidential sources said the explosion was an attack, adding it was not immediately clear whether it was a bomb or an explosive fired at the bus as it travelled along Mohamed V Avenue.
Ambulances rushed from the scene and security forces quickly sealed off the area.
Tunisia has suffered two major attacks this year targeting its tourism industry. A gunman killed 38 foreigners at a beach hotel in June and in March, gunmen killed 21 tourists in an attack at the Bardo Museum in Tunis.
Islamic State claimed both attacks.— Reuters