A police convoy arrived in the early hours of Monday (July 18) at France's counter-terrorism headquarters in Levallois-Perret, a suburb of Paris, as investigations into the Nice truck attack continued.
Police arrested a man and a woman in the French city of Nice on Sunday morning in connection with the truck attack that killed at least 84 people celebrating Bastille Day, a judiciary source said.
Authorities have now detained seven people over the killings, claimed by Islamic State.
The 31 year-old Tunisian killer, Mohamed Lahouaiej Bouhlel, drove at the crowd in the Riviera city on Thursday night, zig-zagging along the seafront Promenade des Anglais for two kilometres as a fireworks display marking the French national day ended, until police eventually shot him dead.
