"We must not rule anything out," Valls said. "There is also the risk from chemical or biological weapons," he added.
As the investigation spreads across Europe into the attacks claimed by the Islamic State group, Valls also called on the European Union (EU) to urgently adopt measures to share airline passenger information.
"More than ever, it's time for Europe to adopt the text... to guarantee the traceability of movements, including within the union. It's a condition of our collective security," he said.
Meanwhile, police in France are going to be allowed to carry weapons when they are off duty, according to a directive from police commanders issued today.
At least 129 people were killed in shootings and suicide bombings in the French capital on Friday, targeting a concert hall, bars and restaurants and the Stade de France national stadium.

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