French police have arrested two men, aged 25 and 63, which brings the number of people arrested in connection with the knife attack in a church in Nice to six.
Security and judicial sources said that the two men were arrested on Saturday evening at the home of a person arrested a few hours earlier.
The latter, a 29-year-old Tunisian, is suspected of communicating with the suspected perpetrator of the attack, who is also a 21-year-old Tunisian.
News reports said the recent arrests were carried out in the town of Grasse, near the coast of southern France, near Nice.
The first suspect was a 47-year-old who was arrested Thursday after he appeared next to the attacker in CCTV footage on the eve of the attack.
The second suspect, aged 35, was arrested in Nice on Friday evening, and then a judicial source announced Saturday the arrest of a third person close to the second suspect, as the third, 33-year-old, was present during a police search of the second home, which is his relative.
The accused of carrying out the attack is still in critical condition in hospital, after he was shot by police.
The chief prosecutor for counterterrorism cases in France said that the suspect in the Nice attack arrived from Tunisia on the Italian island of Lampedusa on September 20, and investigators in Italy are also intensifying their investigation into the suspect's movements and contacts in Sicily.
The accused had a judicial record in Tunisia, ranging from cases of public rights to violence and drugs, before he arrived in France in an irregular manner, according to the Tunisian judiciary, which in turn initiated investigations.
An informed source told the French Press Agency, "It is still too early to know whether he benefited from any collusion, what were his motives for coming to France, and when did this idea arose in him?", Adding that the investigation from the Tunisian side "will be decisive."