Washington (CNN) - In the critical battleground state of Florida, the state's Department of Law Enforcement and the U.S. Postal Inspection Service tell CNN they have opened a preliminary investigation into a slew of bogus letters to some voters questioning their citizenship and registration just two weeks before the November election.

Written on fake letterhead of a local county's Supervisor of Elections, the letters say that the county "has received information from the Florida Division of Elections regarding your citizenship status, bringing into question your eligibility as a registered voter."
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