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NEW: The FBI and U.S. Postal Inspection Service are looking into a series of suspicious mailings sent to state election officials and congressional offices. Officials say some of the mailings contained a powdery white substance.

According to a statement from Louisiana Secretary of State spokesperson Trey Williams, an employee who opened a letter sent to the office on Tuesday was not injured but was taken to the emergency room as a precaution. Law enforcement found no evidence of harmful substances.

According to a communication from the Senate's Sergeant at Arms (SAA) to congressional staff I obtained, law enforcement officials are "working to intercept any additional letters before they are delivered, however, it is possible that some letters may reach their destinations."

Deputy Chief Inspector Brendan Donahue of the U.S. Postal Inspection Service says that the organization was able to stop the delivery of at least one of the mailings.