Election officials in at least two states contact law enforcement after threatening emails sent to voters - CNN

The emails came from an address that appeared to be affiliated with a far-right group, though an analyst who reviewed one email obtained by CNN said it had been sent using foreign internet infrastructure.

The identity of the person or group behind the messages was unknown, said TJ Pyche, a spokesperson for the Alachua County Supervisor of Elections in Florida.

Pyche said his office "got flooded with phone calls and emails" from dozens of voters about the messages Tuesday and immediately reached out to local, state and federal law enforcement, including the FBI.

#Protect2020"

Roxanne Palmer -- a resident of Alachua County, Florida, who is a Democrat -- said she found one of the emails in her spam folder.

The email was sent from "info@officialproudboys.com" and demanded that she vote for Trump "or we will come after you," according to a copy she forwarded to CNN.

Becky Butscher of the Alachua County Sheriff's Office said her office is "trying to do the best we can to track down the originator" of the messages but she said a deeper investigation of the emails is happening at "a higher level."

CNN asked John Scott-Railton, a senior researcher at the University of Toronto's Citizen Lab, to review metadata contained in the email sent to Palmer.

Vice News earlier reported that it had obtained an email that had been sent using infrastructure in Estonia.

"This isn't someone with a fake email account sending messages.