Belgian police are meanwhile raiding six properties in and around Brussels, linked to suspected Paris attackers Bilal Hadfi and Salah Abdeslam.
It remains unclear whether the suspected organiser of the attacks was killed in Wednesday's raid in Paris.
Friday's attacks killed 129 people.
French PM Manuel Valls has warned that France could face chemical or biological attack from terror groups, as MPs debate extending the state of emergency after the Paris attacks.