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NICE, FRANCE - JULY 17: People gather and lay tributes on the Promenade des Anglais on July 17, 2016 in Nice, France.A French-Tunisian attacker killed 84 people as he drove a lorry through crowds, gathered to watch a firework display during Bastille Day Celebrations. The attacker then opened fire on people in the crowd before being shot dead by police.(Photo by Patrick Aventurier/Getty Images)

NICE, FRANCE - JULY 17: People gather and lay tributes on the Promenade des Anglais  on July 17, 2016 in Nice, France.A French-Tunisian attacker killed 84 people as he drove a lorry through crowds, gathered to watch a firework display during Bastille Day Celebrations. The attacker then opened fire on people in the crowd before being shot dead by police.(Photo by Patrick Aventurier/Getty Images)