Sylvie Arnaud's first feeling when she learnt her son Louis had been detained in Iran in September last year was sheer incredulity, followed by a raging sense of injustice and impotence."We don't know how long this will last, we don't know what the Iranians are waiting for and we will probably never know," she told AFP.
Louis Arnaud, described by his family as a passionate traveller who simply wanted to see the world, is one of four French nationals held in prison in Iran.
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