The U.S. Secret Service says a suspicious letter has been intercepted by White House mail screeners.
The agency responsible for protecting U.S. presidents, says the letter was similar to poison letters sent to New York Mayor Michael Bloomberg that were intercepted on May 29.
Two threatening letters to Bloomberg -- both postmarked in the state of Louisiana -- were found to contain traces of the deadly poison ricin.
They were sent recently to Bloomberg’s New York office and to his gun control group in Washington.
The Secret Service said on May 30 that the suspicious letter intercepted at the White House has been turned over to the FBI’s Joint Terrorism Task Force for testing and investigation.
Based on reporting by AP and AFP