France held a countrywide moment of silence today to remember the victims, but the national mourning was punctured by anger and political division. Crowds massed on the Riviera seafront booed the visiting prime minister, whose Socialist government is coming under increasing criticism from the public and the conservative opposition for failing to prevent the Bastille Day carnage.
The driver's uncle, Sadok Bouhlel, told The Associated Press in Tunisia that given Bouhlel's family problems, he was estranged from his wife and three children, the Algerian extremist "found in Mohamed an easy prey for recruitment."
French officials couldn't confirm Monday that attacker Bouhlel had been approached by an Algerian recruiter, saying that the investigation is ongoing.
Bouhlel's rapid radicalization has puzzled investigators. Friends and family said he hadn't been an observant Muslim in the past. Cazeneuve said Monday on RTL radio that the driver may have been motivated by IS messages, but not necessarily coordinating with a larger network.
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Dr. Raj Persaud, a consultant psychiatrist and professor at London's Gresham College, said Bouhlel's path toward violent extremism might have been longer than people around him noticed.
"This is someone who was already deeply disturbed and had already been on a journey, and at the end of it, maybe there was what looks like a rapid process of radicalization. But that was just what crystallized his beliefs, a lot of the huge transformation had already occurred in the background," he said.
"He made more than 80 families grieve, and stained the reputation of our town and our country," he said.
Many of the dead and injured were children watching a fireworks display with their families. Cazeneuve said 59 people were still hospitalized after Thursday's attack, 29 of them in intensive care, out of 308 people injured overall.