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The newspaper lists six establishments as being targeted: in Toulon, Aix-en-Provence and Marseille, Valence and Nîmes, Luynes, Villepinte, and Nanterre.

Nine years ago, Haïm was the conductor in a highly provocative staging of “Il Trionfo” at the summer Aix-en-Provence festival that included a filmed clip of the French theorist Jacques Derrida, who was sometimes accused of doing to literary studies what Boulez had done to music, and vice versa.

In a statement, Aix-en-Provence chief prosecutor Jean-Luc Blachon said that Tuesday's arrests were the result of investigations carried out over recent months, and that police were examining "several spots in the area".

It has since triumphed at the Festival d’Aix-en-Provence before arriving Oct.

Franck Rastoul, a public prosecutor at the Aix-en-Provence court of appeal, has warned of the scourge of drug-related violence, saying that young people were "intoxicated by easy drug money" to the point of "total disregard for human life".