Patrols were increased nationwide as officials feared follow-up attacks.
Two of the gunmen, who targeted tourists at a museum, were reportedly Tunisians who trained in Libya.
The assault on Tunisia’s most renowned museum, in which gunmen killed at least 19 people, could heighten tensions in a nation that has become deeply divided between pro- and anti-Islamist factions.
As Iraqi troops clear Islamic State fighters from towns, residents wonder about when they will be able to return.
Iraqi forces pressed into Saddam Hussein’s home town in a decisive battle against the jihadists.
U.S. officials praise the victory but worry about the key role played by Iranian-backed militias.
Sunni tribesmen are supporting Shiite militias in the battle for Tikrit. But such unity is fragile.
Pro-government fighters have routed militants east and south of Tikrit but are stuck outside the city.
The offensive to oust the Islamic State from a key stronghold could morph into an urban war of attrition.
The operation marks the third attempt to drive the militants from Tikrit since they seized it in June.