Cazeneuve says: "These links for now have not been established by the investigation."
Authorities say Mohamed Lahouaiej Bouhlel, a Tunisian living in Nice, had become recently and rapidly radicalized.
Cazeneuve said 59 people are still hospitalized after the attack Thursday, 29 of them in intensive care, out of 308 people injured overall. Many of the dead and injured were children watching a fireworks display with their families.
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