(NEWSER) – Nevada regulators ordered daily fantasy sports sites like DraftKings and FanDuel to shut down Thursday, saying the hard-to-miss sites that have flooded the marketplace with TV and Internet ads cannot operate in the state without a gambling license.

The decision comes amid growing backlash by regulators and investigators, including New York's attorney general, after it was revealed employees often played on competing sites, raising questions about possible insider information being used to win. Nevada regulators govern the country's main gambling hub in Las Vegas, and their actions could hold sway with regulators elsewhere, who currently treat fantasy sports as games of skill, not chance.

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