Truck Rams Bastille Day Celebration in Nice, France

French police secure the area as the investigation continues at the scene near the heavy truck that ran into a crowd at high speed killing scores who were celebrating the Bastille Day July 14 national holiday on the Promenade des Anglais in Nice, France,

French gendarmes prevent people to enter the scene where a truck mowed through revelers in Nice, southern France, Friday, July 15, 2016.

A man reacts as he sits near a French flag along the beachfront the day after a truck ran into a crowd at high speed killing scores celebrating the Bastille Day July 14 national holiday on the Promenade des Anglais in Nice, France, July 15, 2016.

A police officer looks up as France's tricolour hangs at half mast next to Britain's Union Flag on the roof of 10 Downing Street in central London, July 15, 2016.

French President Francois Hollande leaves the Elysee Palace in Paris, France, July 15, 2016.

French police and investigators gather on the beachfront as a French Navy ship patrols the day after a truck ran into a crowd at high speed killing scores celebrating the Bastille Day July 14 national holiday on the Promenade des Anglais in Nice, France,

Bodies of victims covered by sheets at the scene of a truck attack in Nice, southern France, Friday, July 15, 2016.

Bodies of victims covered by sheets at the scene of a truck attack in Nice, southern France, Friday, July 15, 2016.

A man walks through debris scatterd on the street the day after a truck ran into a crowd at high speed killing scores celebrating the Bastille Day July 14 national holiday on the Promenade des Anglais in Nice, France, July 15, 2016.

A woman cries asking for her son as she walk near the scene of an attack after a truck drove onto 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

The colors of the French flag are projected on the Angel of Independence monument in Mexico City, Mexico, July 14, 2016.

A police car is parked near the scene 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.

Bodies are seen on the ground after a truck ran into a crowd in Nice, France during a celebration for the Bastille Day national holiday, July 14, 2016.

French police forces and forensic officers stand next to a truck July 15, 2016, that ran into a crowd celebrating the Bastille Day national holiday on the Promenade des Anglais in Nice, France, July 14.

A man sits next to a body seen on the ground July 15, 2016, after a truck ran into a crowd celebrating the Bastille Day national holiday July 14 in Nice, France.

People cross the street with their hands on their heads as a French soldier secures the area July 15, 2016, after a truck ran into a crowd celebrating the Bastille Day national holiday along the Promenade des Anglais in Nice, France.

French soldiers cordon the area where the truck ran into the crowd.

An injured individual is seen on the ground near the scene of the attack.

In this video grab taken Thursday July 14, 2016, a policeman chase people out of the cordoned-off area 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.

An injured person is awaits medical care.

French soldiers advance on a street.

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

French police forces and forensic officers stand next to a truck that ran into a crowd celebrating the Bastille Day national holiday on the Promenade des Anglais killing at least 60 people in Nice, France, July 15, 2016.

Leaders stand for a minute of silence for the victims of a deadly attack in the French city of Nice, before the opening session of the Asia-Europe Meeting (ASEM) summit in Ulaanbaatar, Mongolia, Friday, July 15, 2016.