Ehud Arye Laniado, 65, died during a penis enlargement operation in Paris

A billionaire diamond trader has died after 'suffering a heart attack' during a penis enlargement operation in Paris.

Ehud Arye Laniado, 65, was at an unidentified private clinic on the Avenue des Champs-Elysees in the French capital on Saturday when complications during surgery proved fatal.

The experienced diamond expert's heart attack happened when a substance was injected into his penis, Belgian media reported. 

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