The Turnverein Wasen gym in the canton of Bern, in the Emmental region of Switzerland, has now convened an emergency committee to examine the claims.
According to reports in the Swiss media, volley ball instructors were unwittingly filmed as they stripped for showers. Police have now confirmed that this took place.
News of the secret cameras, which was revealed by local radio station Neo1 and the Berner Zeitung newspaper, has sparked uproar in the small town, 20 Minutes reported.
According to the town's prosecutor, the accused - who is an employee of the cantonal police force - faces charges of violating the privacy and intimacy of his victims.
The gym’s president Kurt Aeschlimann said that he was “deeply shocked and saddened” by the incident.
“On behalf of the company, we regret the incident very much and are now looking at how we deal with it,” Aeschlimann told the Suedostschweiz news website.