Police officers stand guard near Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (Eric Gaillard/Pool via AP)

Forensic police officers inspect the scene of a knife attack at Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (Eric Gaillard/Pool via AP)

French President Emmanuel Macron meets rescue workers after a knife attack at Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (Eric Gaillard/Pool via AP)

A man prays in the street outside the Notre Dame church in Nice, southern France, after a knife attack took place on Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. (AP Photo/Daniel Cole)

Police work behind a restricted zone near the Notre Dame church in Nice, southern France, after a knife attack took place on Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. (AP Photo/Daniel Cole)

The sun sets behind the Notre Dame church in Nice, southern France, after a knife attack took place on Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. (AP Photo/Daniel Cole)

People stand near the scene of the knife attack at the Notre Dame church, in Nice, France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed three people at a church in the Mediterranean city of Nice, the third attack in two months in France. (AP Photo/Daniel Cole)

French President Emmanuel Macron, second left, and Nice mayor Christian Estrosi , third left, meet police officers after a knife attack at Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (Eric Gaillard/Pool via AP)

French President Emmanuel Macron, center, arrives at Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (Eric Gaillard/Pool via AP)

Residents look out of their windows near the Notre Dame church in Nice, southern France, after a knife attack took place on Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. (AP Photo/Daniel Cole)

A forensic police officer works at the scene of a knife attack at Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (Eric Gaillard/Pool via AP)

Police officers stand guard near Notre Dame church in Nice, southern France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed at least three people at a church in the Mediterranean city of Nice, prompting the prime minister to announce that France was raising its security alert status to the highest level. It was the third attack in two months in France amid a growing furor in the Muslim world over caricatures of the Prophet Muhammad that were re-published by the satirical newspaper Charlie Hebdo. (AP Photo/Daniel Cole)

French policemen and forensic officers work on the scene of the knife attack in front of Notre Dame church, in Nice, France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed three people at a church in the Mediterranean city of Nice, the third attack in two months in France. (AP Photo/Daniel Cole)

French policemen and forensic officers work on the scene of the knife attack in front of Notre Dame church, in Nice, France, Thursday, Oct. 29, 2020. An attacker armed with a knife killed three people at a church in the Mediterranean city of Nice, the third attack in two months in France. (AP Photo/Alexis Gilli)