Attack in Nice, France

(CNN) A day after a terrorist mowed down dozens of people celebrating Bastille Day in the coastal French city of Nice, investigators dug into the life of the man they say was the killer: A 31-year-old delivery driver and Nice resident who was born in Tunisia.

Authorities said Mohamed Lahouaiej Bouhlel drove a rented, refrigerated truck weighing about 20 tons into crowds along a roughly 2-kilometer stretch of Promenade des Anglais on Thursday night, killing 84 people -- including 10 children and adolescents -- and injuring 202 others.

The attack ended when police shot into the truck, killing Bouhlel, French prosecutor François Molins said Friday.

Of the injured, 52 were in critical condition, and 25 were in a coma, Molins said. President Francois Hollande described the most seriously injured as being "between life and death."

Staff at the Lenval Hospital in Nice said 28 children remained hospitalized.

Hollande, addressing his country following its third major terrorist attack in 18 months, described the assault as an "unspeakable act" and vowed that France would "be able to overcome all trials." 

"We have an enemy who is going to continue to strike all the people, all the countries who have freedom as a fundamental value," Hollande said.