French police have now arrested five people in Nice, in connection with the Bastille day attack that killed at least 84 people when a truck rammed into crowds in the Riviera city.
Three people were detained following early morning raids on Saturday, while two others were arrested on Friday, the Paris Prosecutor's office says.
French authorities are still trying to determine whether 31-year old Mohamed Lahouaiej-Bouhlel - the Tunisian driver of the vehicle - acted alone or with accomplices, and whether his motives are connected to radical Islam.
The arrests concern the attacker's "close entourage", sources have told Reuters news agency - and French publication Le Monde has since reported that one of those in custody is his estranged wife.
Witnesses say about 40 elite police raided a small apartment at Rue Miollis, north of the central station, where one individual was arrested.
AAP / Newshub.