Protesters in Venice are claiming an "enormous victory" after US tech billionaire Jeff Bezos and his wedding guests were forced to "run away" from the city centre, moving their main celebration to another location.

Protesters in Venice claim their threat to blockade the city’s canals has forced a venue change for a party to celebrate the wedding of billionaire Amazon founder Jeff Bezos and journalist Lauren Sanchez.

The wedding, hosted in Venice, Italy, is expected to cost millions of dollars as residents protest the upcoming luxury event.