Police arrested a man and a woman in the French city of Nice this 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.

French authorities have yet to produce evidence that he had turned to radical Islam.

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