FBI investigates suspicious mail sent to election offices

Federal authorities are investigating suspicious mailings sent to election offices and congressional offices across the United States, including letters containing an unidentified substance, as they work to intercept further deliveries and determine who sent them. The FBI said it and the U.S. Postal Inspection Service are responding to mail sent to addresses nationwide, including state secretaries of state and related election offices. The Senate Sergeant at Arms warned offices that additional letters might still reach recipients despite efforts to intercept them. Authorities have not named a sender or disclosed the contents of every mailing. Three election officials briefed on the investigation said they were told more than 100 letters had been sent to people and groups nationwide. The FBI has not provided a total. Reports describe deliveries or attempted deliveries in multiple states, but some packages were intercepted before reaching their intended recipients. Mail containing powder prompted evacuations at election offices in Louisiana and Oklahoma. Louisiana officials said an employee who opened a package went to an emergency room as a precaution; authorities reported no...