At least five people were wounded in the Tunisian capital on Thursday when a suicide bomber blew himself up, the government said.
The bomber targeted a police patrol in Charles de Gaulle Street in central Tunis. Two police officers and three civilians were wounded, the Interior Ministry said.
It was not immediately known who was behind the attack.
Tunisia has been battling militant groups operating in remote areas near the border with Algeria since an uprising overthrew autocratic leader Zine Abidine Ben Ali in 2011.
High unemployment has also stoked unrest in recent years.
Dozens of people died in attacks in 2015 including two against tourists - one at a museum in Tunis and another on a beach in Sousse. A third attack targeted presidential guards in the capital and killed 12. Islamic State claimed the attacks.