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A man has blown himself up after being pursued by police in the Tunisian capital, days after twin bombings claimed by the Islamic State group killed a police officer in the city.

The Tunisian state-run news agency that the incident, which caused no other casualties, took place in the north of the city.

A police spokesman that the man was a wanted militant called Aymen Smiri, and that police fired at him before he detonated an explosive vest.

Last week, two suicide bombers launched a double attack in Tunis, killing a police officer person and leaving several others injured.

The violence has revived fears for the stability of the North African state, which is seen as a rare democratic success story of the 2011 Arab Spring uprisings but has been hit by repeated Islamist attacks.