France has called up 12,000 police
reservists to help boost security after Thursday's attack in Nice in
which more than 80 people were killed.
So-called Islamic State claimed one of its followers carried out the attack.
A news agency linked to the group, Amaq Agency, said: "He did the attack in response to calls to target the citizens of the coalition that is fighting the Islamic State. "Five people believed to be linked to Lahouaiej-Bouhlel, including his estranged wife, are in police custody, the Paris prosecutor's office said.