The latest attack occurred in the French city of Nice on Thursday. Three people were stabbed to death at a church. While an investigation is underway, French President Emmanuel Macron was quick to say the French people are under attack by "Islamist and terrorist madness."

Thursday's killings follow the gruesome beheading of schoolteacher Samuel Paty in a northern Paris suburb earlier this month. A Chechen refugee beheaded Paty after he showed his students cartoons of prophet Muhammad in a freedom of expression lesson.

Besides Macron's warning, Interior Minister Gerald Darmanin told RTL radio on Friday, quoted by RT News, that the country must be prepared for future attacks as it battles Islamic extremism. 

"We are in a war against an enemy that is both inside and outside. We need to understand that there have been and there will be other events such as these terrible attacks," Darmanin said on RTL radio.