November 10, 2010 at 03:47 PM EST

NBC’s The Biggest Loser has been forced to stop production because of a crew walkout that’s part of an ongoing effort to unionize, Deadline reports. The International Association of Theater and Stage Employees, the film and TV crew union, showed up on the set Monday and led the workers in the demonstration, forcing filming to stop. Production remains shut down while the union and production company Reveille negotiate behind the scenes.

UPDATE: Union confirms it is on strike against Biggest Loser

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