French police are searching the home of the prime suspect in a terrorist attack on Bastille Day in Nice that left 84 people dead and another 18 critically injured.
A truck barrelled down the famed Promenade des Anglais seafront, sending hundreds of terrified people fleeing and leaving bodies strewn in its wake in what has been described as the "worst catastrophe" in the French Riviera's modern history.
The driver then fired a pistol several times before being shot dead by police, authorities said.
The identity papers of a 31-year-old resident of Nice who was born in Tunisia were found inside.
Police said he was known to them as a petty criminal and his home was being searched.
"Investigations are currently under way to establish if the individual acted alone or if he had accomplices who might have fled," interior ministry spokesman Pierre-Henry Brander said.
No group has claimed responsibility.
President Francois Hollande has been meeting his National Security Advisers before travelling to Nice.