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EDITORS NOTE: Graphic content / Rescue workers help injured people to get in a ambulance on July 15, 2016, after a truck drove into a crowd watching a fireworks display in the French Riviera town of Nice. A truck ploughed into a crowd in the French resort of Nice on July 14, leaving at least 60 dead and scores injured in an "attack" after a Bastille Day fireworks display, prosecutors said on July 15. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

EDITORS NOTE: Graphic content / Police officers, firefighters and rescue workers are seen at the site of an attack on July 15, 2016, after a truck drove into a crowd watching a fireworks display in the French Riviera town of Nice. A truck ploughed into a crowd in the French resort of Nice on July 14, leaving at least 60 dead and scores injured in an "attack" after a Bastille Day fireworks display, prosecutors said on July 15. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

A police officer stands next to a dead body covered with a blue sheet on the Promenade des Anglais seafront in the French Riviera town of Nice on July 15, 2016, after a van drove into a crowd watching a fireworks display. At least 75 people were killed when a truck drove into a crowd watching a fireworks display in the French resort of Nice, a lawmaker said on July 15. / AFP PHOTO / VALERY HACHEVALERY HACHE/AFP/Getty Images

EDITORS NOTE: Graphic content / People react in the French Riviera town of Nice on July 15, 2016, after a van drove into a crowd watching a fireworks display. At least 60 people were killed when a truck ploughed into a crowd watching a Bastille Day fireworks display in the southern French resort of Nice, prosecutors said early on July 15. Nice prosecutor Jean-Michel Pretre said the truck drove two kilometres (1.3 miles) through a large crowd that was watching the fireworks. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

Police approach the driver's cab of a truck, in Nice, France, late Thursday July 14, 2016. The large truck plowed through revelers gathered for Bastille Day fireworks in Nice, killing at least 84 people and sending others fleeing into the sea as it bore down for more than a mile (2 Km) along the Riviera city's famed waterfront promenade. The driver was killed by police and no one immediately claimed responsibility for the Thursday night attack. (NADER EL SHAFEI via AP) MANDATORY CREDIT

A woman places a candle during a vigil to honor victims of the Bastille Day tragedy in Nice, France, in Sydney, Australia, Friday, July 15, 2016. World leaders are expressing dismay, sadness and solidarity with France over the attack carried out by a man who drove truck into crowds of people celebrating France's national day in Nice. (AP Photo/Rob Griffith)

People gather and sing the French national anthem at a vigil in a tribute to the victims of the Bastille Day attack, in Sydney, Australia, Friday, July 15, 2016. World leaders are expressing dismay, sadness and solidarity with France over the attack carried out by a man who drove truck into crowds of people celebrating France's national day in Nice. (AP Photo/Rob Griffith)

This photo taken on July 15, 2016 shows the French and European Union flags flying at half-mast in front of the European Parliament building in Strasbourg, eastern France, on July 15, 2016, the day after a gunman smashed a truck into a crowd of revellers celebrating Bastille Day in Nice, killing at least 84 people. A Tunisian-born man zigzagged a truck through a crowd celebrating Bastille Day in the French city of Nice, killing at least 84 and injuring dozens of children in what President Francois Hollande on July 15 called a "terrorist" attack. / AFP PHOTO / FREDERICK FLORINFREDERICK FLORIN/AFP/Getty Images

NICE, FRANCE - JULY 15: Forensic police investigate a truck at the scene of a terror attack on the Promenade des Anglais on July 15, 2016 in Nice, France. A French-Tunisian attacker killed 84 people as he drove a truck 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)

Police officers work near the truck that mowed through revelers in Nice, southern France, Friday, July 15, 2016. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, killing more than 80 people and sending people fleeing into the sea as it bore down for more than a mile along the Riviera city's famed waterfront promenade. (AP Photo/Francois Mori)

French gendarmes walk past clothes and mattresses at the site of the deadly attack on the Promenade des Anglais seafront in the French Riviera city of Nice on July 15, 2016, after a gunman smashed a truck through a crowd celebrating Bastille Day, killing at least 84 and injuring dozens of children in what President Francois Hollande called a "terrorist" attack. Hollande declared three days of mourning after the assault, as the shellshocked country found itself again mourning its dead after attacks on Charlie Hebdo magazine in January 2015 and the November 2015 massacre in Paris. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

Roses are attached at a barrier near the scene after a truck attack in Nice, southern France, Friday, July 15, 2016. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, killing more than 80 people and sending people fleeing into the sea as it bore down for more than a mile along the Riviera city's famed waterfront promenade. (AP Photo/Francois Mori)

A life-size copy of renown Michelangelo Buonarroti's David is diplayed supine, as a tribute to the victims of Nice attack, during a ceremony at Repubblica square in Florence, Italy, July 15, 2016. France was ravaged by its third attack in two years when a large white truck mowed through revelers gathered for Bastille Day fireworks in Nice, killing at dozens of people as it bore down on the crowd for more than a mile along the Riviera city's famed seaside promenade. (Maurizio Degl'Innocenti/ANSA Via AP)

NICE, FRANCE - JULY 15: People visit the scene and lay tributes to the victims of a terror attack on the Promenade des Anglais on July 15, 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 David Ramos/Getty Images)

Police officers and a soldier stand by the sealed off area of an attack after a truck drove on to the sidewalk and plowed through a crowd of revelers who'd gathered to watch the fireworks in the French resort city of Nice, southern France, Friday, July 15, 2016. A spokesman for France's Interior Ministry says there are likely to be "several dozen dead" after a truck drove into a crowd of revelers celebrating Bastille Day in the French city of Nice. (AP Photo/Ciaran Fahey)

A man walks with his hands up as police officers carry out checks on people in the centre of French Riviera town of Nice, after a van that ploughed into a crowd leaving a fireworks display on July 14, 2016. At least 60 people are feared dead after a van drove into a crowd watching Bastille Day fireworks in the French resort of Nice on July 14, authorities said on July 15. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

Police officers carry out checks on vehicles in the centre of French Riviera town of Nice, after a van drove into a crowd watching a fireworks display on July 14, 2016. At least 60 people are feared dead after a van drove into a crowd watching Bastille Day fireworks in the French resort of Nice on July 14, authorities said on July 15. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

EDITORS NOTE: Graphic content / Rescue workers help an injured woman to get in a ambulance on July 15, 2016, after a truck drove into a crowd watching a fireworks display in the French Riviera town of Nice. A truck ploughed into a crowd in the French resort of Nice on July 14, leaving at least 60 dead and scores injured in an "attack" after a Bastille Day fireworks display, prosecutors said on July 15. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images

A soldier stands guard near the site of an attack in the French Riviera town of Nice, after a van that ploughed into a crowd leaving a fireworks display on July 14, 2016. Up to 30 people are feared dead and over 100 others were injured after a van drove into a crowd watching Bastille Day fireworks in the French resort of Nice on July 14, a local official told French television, describing it as a "major criminal attack". / AFP PHOTO / VALERY HACHEVALERY HACHE/AFP/Getty Images

EDITORS NOTE: Graphic content / Police officers stand near a van, with its windscreen riddled with bullets, that ploughed into a crowd leaving a fireworks display in the French Riviera town of Nice on July 14, 2016. At least 60 people were killed when a truck ploughed into a crowd watching a Bastille Day fireworks display in the southern French resort of Nice, prosecutors said early on July 15. Nice prosecutor Jean-Michel Pretre said the truck drove two kilometres (1.3 miles) through a large crowd that was watching the fireworks. / AFP PHOTO / VALERY HACHEVALERY HACHE/AFP/Getty Images

EDITORS NOTE: Graphic content / A picture taken on July 15, 2016 shows the dead body of a person on the ground after a van drove into a crowd watching a fireworks display in the French Riviera town of Nice. At least 60 people were killed when a truck ploughed into a crowd watching a Bastille Day fireworks display in the southern French resort of Nice, prosecutors said early on July 15. Nice prosecutor Jean-Michel Pretre said the truck drove two kilometres (1.3 miles) through a large crowd that was watching the fireworks. / AFP PHOTO / Valery HACHEVALERY HACHE/AFP/Getty Images