Flavio Bomio (69), a member of FINA's Technical Open Water Swimming Committee and one-time coach to the Swiss national team who once guided Flavia Rigamonti, is accused of sexual misconduct with 20 alleged victims.
Bomio is under arrest, the timing of matters deliberately timed to prevent him from leaving for a training camp in Florida. The allegations relate to under-age swimmers, 12 to 16 years of age, and stem back to the 1970s. A doctor and psychologist are said to be monitoring Bomio in prison.
Coach to the Bellinzona club, Bomio was a member of Switzerland team staff at the 1984, 1988 and 2000 Olympic Games. Former Swiss sprinter Stefan Volery is quoted in the Swiss media as saying that there was a "strange relationship" between the unmarried Bomio and teenagers who were "submissive" to him.
Questions had been asked but nothing ever taken any further, according to Blick.
Rigamonti's mother Franca told the publication: "I am totally shocked. I can't say more than that."
FINA has been in touch with the Swiss federation, which is to look into strengthening athlete protection measures.