The Catalan police working under an investigation, codenamed Cursa, which began last December, seized a number of banned substances including EPO and Clenbuterol.
All are said to have been imported into Spain from Portugal and Andorra by one supplier. Members of the group subsequently sold them on in local gyms to amateur athletes, triathletes and cyclists.
The police were reportedly informed by Xavier Tondo, who was approached via email by the doping ring.
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