Officers from the Athens Security Sub-Directorate went to the private clinic and to the singer's home in Voula as part of the inquiry.
The visits follow the cardiac arrest incident involving Giorgos Mazonakis. No further details on the medical event or possible causes have been released by authorities.
Police continue to collect information. The case involves examination of circumstances at the clinic and the residence.
Next steps in the investigation have not been disclosed.
[EDITOR'S NOTE: Source content insufficient. Enrichment recommended on: timeline of events, medical outcome, official statements, clinic identity, exact police actions.]
