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A picture taken on October 15, 2016 in Nice, southeastern France shows a general view of the ceremony in tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

A picture taken on October 15, 2016 in Nice, southeastern France shows a general view of the ceremony in tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)
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AFP VALERY HACHE

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TOPSHOT - A picture taken on October 15, 2016 in Nice, southeastern France shows a general view of the ceremony in tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)

TOPSHOT - A picture taken on October 15, 2016 in Nice, southeastern France shows a general view of the ceremony in tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)
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AFP ERIC GAILLARD

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A picture taken on October 15, 2016 in Nice, southeastern France shows victims in front of 86 white roses, each representing one of the deceased people, during a national tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)

A picture taken on October 15, 2016 in Nice, southeastern France shows victims in front of 86 white roses, each representing one of the deceased people, during a national tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)
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AFP ERIC GAILLARD

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A man looks at a cross and toys placed in tribute to victims in front of a makeshift memorial at the Promenade des Anglais in Nice, southeastern France, on October 15, 2016, on the occasion of a national tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / ANNE-CHRISTINE POUJOULAT (Photo credit should read ANNE-CHRISTINE POUJOULAT/AFP/Getty Images)

A man looks at a cross and toys placed in tribute to victims in front of a makeshift memorial at the Promenade des Anglais in Nice, southeastern France, on October 15, 2016, on the occasion of a national tribute to the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP / ANNE-CHRISTINE POUJOULAT (Photo credit should read ANNE-CHRISTINE POUJOULAT/AFP/Getty Images)
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AFP ANNE-CHRISTINE POUJOULAT

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French President Francois Hollande pays his respects during a national tribute on October 15, 2016 in Nice, southeastern France in memory of the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP PHOTO / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)

French President Francois Hollande pays his respects during a national tribute on October 15, 2016 in Nice, southeastern France in memory of the victims of the July 14 terror attack in which a truck ploughed into crowds celebrating Bastille Day, killing 86 people and injuring more than 400. In the attack, a 31-year-old Tunisian extremist rammed a 19-ton truck through a crowd of more than 30,000 Bastille Day revellers on the seafront Promenade des Anglais before police shot him dead. The Islamic State (IS) group said the driver of the truck, Mohamed Lahouaiej Bouhlel, was one of its followers. / AFP PHOTO / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)
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AFP ERIC GAILLARD