At least 18 people have been arrested after a wave of hoax bomb threats prompted evacuations across France.
The Palace of Versailles, the Louvre, as well as schools, airports and hospitals have all been targeted.
Those behind the disruption are mostly minors, authorities say.
The threats come at a time of heightened tension in France, after a teacher was fatally stabbed by an alleged jihadist last week at a school in the northern city of Arras.
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