French police officers patrol on the Champs Elysees in Paris, Sunday, Nov. 15, 2015. Thousands of French troops deployed around Paris on Sunday and tourist sites stood shuttered in one of the most visited cities on Earth while investigators questioned the relatives of a suspected suicide bomber involved in the country's deadliest violence since World War II. (AP Photo/Kamil Zihnioglu)
Infrastructures critiques
French police officers patrol on the Champs Elysees in Paris, Sunday, Nov. 15, 2015. Thousands of French troops deployed around Paris on Sunday and tourist sites stood shuttered in one of the most visited cities on Earth while investigators questioned the relatives of a suspected suicide bomber involved in the country's deadliest violence since World War II. (AP Photo/Kamil Zihnioglu)
