Federal law enforcement officials are investigating reports of suspicious letters sent to public officials, a Justice Department spokesperson said Thursday.

“We are aware of the reports and the FBI and U.S. Postal Inspection Service are investigating this matter,” the department spokesperson said in response to an inquiry from CNN.

Public officials in California, Georgia, Nevada, Oregon, Texas and Washington state have reported receiving suspicious mail. Most of the letters appear to have targeted election offices.

Investigators are treating all the letters as connected for now, given the timing, a law enforcement official told CNN.

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