Local newspaper Nice-Matin reported the man had firearms and grenades in the lorry with him at the time of the attack.
According to the AFP news agency, which quoted a police source, the man has been identified by papers found inside the cab of the lorry.
The papers indicate the man was a resident of Nice, AFP reported.
French city of Nice was hit by a terrorist attack on July 14 night.
Reports indicate that a truck ploughed into crowds watching a fireworks display on France`s Bastille Day national holiday on the Nice seafront.
France’s Interior Ministry said 84 people were killed in the attack.
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