French President Francois Hollande has said the state of emergency was extended in the country for three months as at least 80 people were killed on Thursday night when a truck mowed through a crowd in Nice.
Hollande on Friday said the truck attack was of a "terrorist character".
"An attack on the terrorist nature cannot be denied," BFMTV quoted Hollande as saying.
"We must do everything so that we can fight against the scourge of terrorism," he said. "This is France, which is under the threat of Islamist terrorism."
Over 150 people were also injured in the mayhem.
At least 130 people were killed and over 250 injured in another massive terror attacks in the country in November in 2015.