French President Hollande said 50 of the injured are in critical condition.
As many as 84 people, including at least 10 kids, died after a truck rammed into a crowd late on Thursday night in the southern French city of Nice. Around 30,000 people were out celebrating France's Bastille Day, the country's day of liberty, with many families staying up late to watch the fireworks.
Eyewitnesses said the truck was driving at full speed towards the crowd, zigzagging to ensure that the vehicle hit as many people as possible. Parents were seen frantically throwing their children to safety.
The driver, a 31-year-old Frenchman of Tunisian descent, was shot dead by police at the scene. He has been identified by local media as Mohamed Lahouaiej-Bouhlel. Guns and a grenade found inside the truck, however, were reported to be fakes.
French President Francois Hollande said 50 of the injured are in critical condition, "between life and death", and that many of the victims were foreigners. Two American citizens, an Ukrainian, a Russian and a Swiss woman are among the dead. Hollande has announced that he will extend the state of emergency for another three months. It has been in place since November, after Islamic State terrorists carried out attacks in Paris, killing 130 people.
World leaders have expressed their sadness and solidarity with France.
While US President Barack Obama condemned "in the strongest terms" what he said appeared to be "a horrific terrorist attack", UK Prime Minister Theresa May said she was "shocked and saddened".
Prime Minister Narendra Modi wrote, "India shares the pain & stands firmly with our French sisters & brothers in this hour of immense sadness."
According to Tunisian security sources, the attacker Lahouaiej-Bouhlel was married with three children. He visited Tunisia frequently, the last time being eight months ago.
Luc Belmont, a taxi driver in Nice, said, "the people of Nice are enraged at what has happened, and heartbroken too." Belmont, however, believes the blame lies with the authorities. "You reap what you sow. These people are getting radicalised in our own jails. We need to stop it there, we have not been dealing with this problem."
Lahouaiej-Bouhlel had been in trouble with the police in the past for petty crime, but he was not on the watch list of radicalised young men.
The French police are still dealing with a scene of a mass murder, that extends over two kilometres. Before there can be tributes to the victims, they have to fully investigate and clear the crime scene.
French Prime Minister Manuel Valls has declared three days of national mourning, starting from Saturday.
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