Mna Guebla detonated a bomb near police cars on the busy upmarket Avenue Habib Bourguiba in central Tunis on October 29, killing herself and wounding 26 people, mostly police officers, Hichem Fourati told parliament.

Fourati said the 30-year-old had received online instructions on bomb-making from "terrorist elements" based in the country's mountainous east, the epicentre of a long-running jihadist campaign of attacks targeting Tunisian security forces.

The attack was the first to rock the Tunisian capital since 2015.

Police sources said the assailant appeared to have used a homemade bomb rather than an explosive belt.

Guebla, who lived in a marginalised rural area in the eastern Mahdia region, was studying for a doctorate and spent hours on the computer locked in her room, but her family said there was no indication she was being radicalised.

After her death, authorities found "a quantity of raw materials used in the manufacture of explosives" at her house, Fourati said.

Local media have reported that her distraught family refused to receive the body and did not attend her burial.