At least 84 people, including two Americans, are dead after what authorities believe to be a terror attack in Nice, France.
A truck drove through a crowd of people who had been watching Bastille Day fireworks along Nice's famous Promenade des Anglais seafront on Thursday night, killing scores of people. Pedestrians scattered out of the truck's path before police killed the driver of the truck, French officials said.
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Sean Copeland and his 11-year-old son, Brodie are among those killed. The Texas family had been in Nice on vacation.
France's president, Francois Hollande, addressed the country early Friday to condemn the attacks.
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"It is France as a whole which is threatened by Islamist terrorism. In such circumstances, we must show our absolute vigilance and determination," he said. "France is strong. France will always be stronger than the fanatics who want to strike France today."
No one has yet claimed responsibility for the attack. The investigation is being handled by the Paris anti-terrorism prosecutor's office.
ABC News contributed to this report.
Brodie, left, and Sean Copeland (Joe West/303 Photos)
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. (Rob Griffith/AP Photo)
Flowers in the colors of the French flag are left on the fence of the French Embassy in Madrid, Spain, Friday, July 15, 2016. (/AP Photo)
A family photo of the Copelands of Texas, two of whom were killed in the attack. From left, Sean (age 51, killed), Maegan, Brodie (age 11, killed), Austin and Kim Copeland. (Family photo)
Soldiers salute during an event to commemorate the victims of an attack in Nice in near the French embassy in Berlin, Germany, Friday, July 15, 2016. (/AP Photo)
Catalan politics hold a minute of silence outside the Generalitat Palace, in Barcelona, Spain, Friday, July 15, 2016. (Manu Fernandez/AP Photo)
A Turkish police special forces officer stands across from the French consulate in central Istanbul's Istiklal Avenue, the main shopping road of Istanbul, Friday, July 15, 2016. (Lefteris Pitarakis/AP Photo)
A woman weeps during an event to commemorate the victims of an attack in Nice near the French embassy in Berlin, Germany, Friday, July 15, 2016. (Markus Schreiber/AP Photo)
A child's toy is placed among the floral tributes laid out near the site of the truck attack in the French resort city of Nice, southern France, Friday, July 15, 2016. (/AP Photo)
Floral tributes are laid out near the site of the truck attack in the French resort city of Nice, southern France, Friday, July 15, 2016. (Luca Bruno/AP Photo)
People lay flowers at the steps of the French Embassy in Kiev, Ukraine, Friday, July 15, 2016. (Efrem Lukatsky/AP Photo)
Flowers and candles are left following the attacks in Nice outside the entrance to the French Consulate Friday, July 15, 2016. (Eric Risberg/AP Photo)
A woman puts flowers near the scene where a truck mowed through revelers in Nice, southern France, Friday, July 15, 2016. (Francois Mori/AP Photo)
Floral tributes are laid out near the site of the truck attack in the French resort city of Nice, southern France, Friday, July 15, 2016. (Luca Bruno/AP Photo)
A teddy bear and candles sit between flowers to commemorate the victims of an attack in the France city Nice in front of the French embassy in Berlin, Germany, Friday, July 15, 201 (Markus Schreiber/AP Photo)
A woman holds a banner during a minute of silence in honor of the victims of the Bastille Day tragedy in Nice, in Barcelona, Spain, Friday, July 15, 2016. (Manu Fernandez/AP Photo)
A man stands next to a half staff French flags, at the Elysee palace in Paris, Friday, July 15, 2016. (Thibault Camus/AP Photo)
A woman lights a candle in honor of those slain in an attack in Nice at the French Embassy in Warsaw, Poland, on Friday July 15, 2016. (Czarek Sokolowski/AP Photo)
The German ambassador to Poland, Rolf Nikel, carries flowers to place at the French Embassy in Warsaw, Poland, on Friday July 15, 2016. (Czarek Sokolowski/AP Photo)
People react near the scene where a truck mowed through revelers in Nice, southern France, Friday, July 15, 2016. (Francois Mori/AP Photo)
Relative of the victims of the Bastille Day attack comfort each other as they gather in front of Pasteur Hospital in Nice. (Claude Paris/AP Photo)
Parents of victims embrace each other near the scene of a truck attack in Nice, southern France, Friday, July 15, 2016. (Luca Bruno/AP Photo)
A soldier stands next to a half staff French flag, at the Elysee palace in Paris, Friday, July 15, 2016. (Thibault Camus/AP Photo)
People sit overlooking the beach and not far from the site of the truck attack in the French resort city of Nice, southern France, Friday, July 15, 2016. (Luca Bruno/AP Photo)
Forensic officials work on the beach next to the famed Promenade des Anglais, scene of the truck attack, in Nice, southern France, Friday, July 15, 2016. (Sinan Baykent/AP Photo)
Police officers work at the truck that mowed through revelers in Nice, southern France, Friday, July 15, 2016. (Francois Mori/AP Photo)
Leaders stand for a minute of silence before the opening session of the Asia-Europe Meeting (ASEM) summit in Ulaanbaa, Mongolia on Friday, July 15, 2016. (Damir Sagolj/Pool Photo via AP)
French President Francois Hollande, center, with Prime Minister Manuel Valls, left, and Minister of Health Marisol Touraine delivers a speech on Friday. (Eric Gaillard/AP Photo)
View of the famed Promenade des Anglais, scene of the truck attack, in Nice, southern France, Friday, July 15, 2016. (Christian Alminana/AP Photo)
A forensic police woman walks at the scene of an attack after a truck plowed through a crowd in Nice, southern France, Friday, July 15, 2016. (/AP Photo)
Forensic police officers work at the truck that plowed into the crowd in Nice, southern France, Friday July 15, 2016 (Claude Paris/AP Photo)
The truck which slammed into revelers late Thursday, July 14, is seen near the site of an attack in the French resort city of Nice, southern France, Friday, July 15, 2016. (Luca Bruno/AP Photo)
Discarded items are left on the beach, not far from the site of the truck attack in the French resort city of Nice, southern France, Friday, July 15, 2016. (Luca Bruno/AP Photo)
Police officers work near by truck that mowed through revelers in Nice, southern France, Friday, July 15, 2016. (Francois Mori/AP Photo)
Authorities investigate a truck after it plowed through Bastille Day revelers in the French resort city of Nice, France, Thursday, July 14, 2016. (Sasha Goldsmith via AP Photo)
The truck loaded with weapons and hand grenades drove onto a sidewalk for more than a mile, plowing through Bastille Day revelers who'd gathered to watch fireworks. (AP Photo/Luca Bruno)
Security and medical teams work on the famed Promenade des Anglais, scene of the truck attack, in Nice, southern France, early Friday, July 15, 2016. (Sinan Baykent/AP Photo)
A forensic officer stands near a van with its windscreen riddled with bullets, that plowed through a crowd of revelers. (AP Photo/Claude Paris)
(AP Photo/Claude Paris)
(AP Photo/Claude Paris)
(AP Photo/Christian Alminana)
Uninjured but shocked people taking respite in the lobby of Le Negresco hotel. (Alban Mikoczy/France2)
(Harp Detective via AP)
(AP Photo/Ciaran Fahey)
(AP Photo/Ciaran Fahey)
Police officers and a soldier stand by the sealed off area of an attack after a truck plowed through a crowd of revelers in Nice, France. (AP Photo/Ciaran Fahey)
(AP Photo/Ciaran Fahe)
French President François Hollande meets with advisers during an emergency meeting. (Twitter/Elysee)