The arrests were made in relation to an inquiry into the prostitution of seven girls aged between 14 and 18, which started in Annecy in April this year.
Two of those arrested are known to be Taekwondo champions.
“Obviously these individuals were in charge of the ring or profited from the prostitution of these girls,” said Jean-Yves Coquillat, the Grenoble prosecutor.
Coquillat also confirmed the suspects are still being questioned.
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The presumed head of the ring has not yet been arrested, and is thought to be based in Isere.