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French President Francois Hollande bows as he pays his respects, on October 15, 2016 in Nice, southeastern France, during a national tribute 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 / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)

French President Francois Hollande bows as he pays his respects, on October 15, 2016 in Nice, southeastern France, during a national tribute 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 / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)
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AFP ERIC GAILLARD

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French President Francois Hollande leaves the podium after speaking 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 / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

French President Francois Hollande leaves the podium after speaking 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 / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)
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AFP VALERY HACHE

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French President Francois Hollande walks past soldiers as he leaves the stage after his speech 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 / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

French President Francois Hollande walks past soldiers as he leaves the stage after his speech 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 / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)
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AFP VALERY HACHE

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French President Francois Hollande walks past victims on October 15, 2016 in Nice, southeastern France during 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 / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)

French President Francois Hollande walks past victims on October 15, 2016 in Nice, southeastern France during 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 / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)
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French president Francois Hollande reviews the troops on October 15, 2016 in Nice, southeastern France during 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 / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)

French president Francois Hollande reviews the troops on October 15, 2016 in Nice, southeastern France during 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 / POOL / ERIC GAILLARD (Photo credit should read ERIC GAILLARD/AFP/Getty Images)
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AFP ERIC GAILLARD