[TRENDING: Supreme Court Justice Ruth Bader Ginsburg dies at 87 | Trump pushes for 2nd round of $1,200 direct payments | Daylight Saving Time debate]Federal investigators were working to determine where the enveloped originated and who mailed it.
The FBI, the Secret Service and the U.S. Postal Inspection Service were leading the investigation.In a statement, the FBI said agents were working to investigate “a suspicious letter received at a U.S.
government mail facility” and that there is “no known threat to public safety.”Ricin is produced from the seeds of the castor oil plant.