“Our weapons against incivility, such as the Taser or the flash-ball, are obviously worthless in stopping a vehicle," he added, according to franceinfo.fr.

The Tunisian man who drove his lorry into crowds of people in Nice researched the route in the days before the attack, French media have reported.

About 85 people remained hospitalized Sunday, and of those, 18 including a child were still in life-threatening condition, Health Minister Marisol Touraine told reporters on a visit to the city.

Singer Rihanna has cancelled a concert in Nice in the wake of the Bastille Day attack that left at least 84 dead.