On 30 September, the day before the attack, the perpetrator had been arrested in Lyon on suspicion of shoplifting. He was held overnight; however, he was not on the terror watch list and police released him. Authorities in Lyon had considered deporting him, but hesitated due to the uncertainty of his identity. He was carrying a
Tunisian passport when arrested in Lyon on the day before the attack, but not carrying any ID at the time of the attack. French authorities said there was no outward evidence that the attacker had been radicalised. though it was later classified as jihadist terrorism by
Europol. The
ISIS-related
Amaq News Agency claimed that the perpetrator was a "soldier" of the Islamic State. The perpetrator's friends and family dismissed the notion that he was radicalised, saying that he was a drug addict who had lost his way.
Other arrests On 8 October, Italian police arrested a younger brother of the attacker, identified as 25-year-old Anis Hanachi in the town of
Ferrara, after an international arrest warrant had been issued by France. He was being held on suspicion of complicity in the attack and of membership in a terrorist group. He had reportedly
fought in Syria, and had previously been expelled from Italy in 2014 after
arriving in Sicily illegally on a smuggler boat. On 10 October, Swiss police detained two Tunisians in the town of
Chiasso near the Swiss-Italian border, including another brother of the attacker who was "known to foreign police services for his links to jihadist terrorist movements". The couple, a man and a woman who were
seeking asylum in Switzerland were due to be sent back to Tunisia. The man's role in the Marseille attack, "if any, is not clear", Swiss police said. Tunisian authorities said two other siblings of the attacker living in
Bizerte had been held for questioning. ==Reactions==