The man who mowed through a crowd with a truck, killing 84 Bastille Day revellers in Nice on Thursday, had phoned home hours earlier and sent a "laughing" picture from the French city, his brother told Reuters.
During a visit to Nice on Sunday, French Health Minister Marisol Touraine said 18 people, including a child, were still in critical condition, while about 85 people in total were in hospital.
The attack by delivery man Mohamed Lahouaiej Bouhlel at peak holiday time on the Riviera plunged France into new grief and fear, just eight months after jihadi gunmen killed 130 people in Paris.