Krebs urged Americans to visit the department's Rumor Control page, which is designed to debunk disinformation tactics aimed at voters in the buildup to Election Day.

John Cohen, former acting undersecretary at the Department of Homeland Security and an ABC News contributor, said that \"regardless of how the e-mail was sent out, the effect will be the same -- potentially thousands of voters may feel intimidated and scared to vote.\"

\"Law enforcement is investigating a number of scenarios,\" Cohen added, \"whether this email originated domestically, whether it was terrorism, or whether it originated abroad by a foreign entity or individual that was able to compromise the Proud Boys' account.\"

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