Sikh separatist Gurpatwant Singh Pannun reported that the FBI is investigating new threats against him, following an earlier foiled assassination plot. Pannun stated that FBI agents visited his New York home to inform him of the “imminent threat” connected to his participation in a forthcoming referendum in Canada on Punjab’s independence.

Federal investigators are examining “suspicious” letters sent to state election officials and congressional offices, some containing unknown substances. The FBI and U.S. Postal Inspection Service are involved as reports surface from Louisiana and Oklahoma, where packages with white powder prompted evacuations but caused no injuries.