Numerous reports on social media have claimed several explosions have been heard in the French city of Marseille.
There has been no official confirmation from emergency services.
Several media outlets have speculated that sounds were caused by a sonic boom.
Residents said that they have heard blasts and that the walls and windows of their houses shook.
It is not yet clear where in Marseille the alleged blast or blasts took place.
France has been on alert after terror attacks swept through the nation last year.
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