WASHINGTON (AP) — The FBI says suspicious letters sent to President Barack Obama and Sen. Roger Wicker are related and are both postmarked out of Memphis, Tenn., dated April 8.
The FBI says the substance in both letters have preliminarily tested positive for ricin, a potentially fatal poison.
In an intelligence bulletin obtained by The Associated Press, the FBI says the letters both say: "To see a wrong and not expose it, is to become a silent partner to its continuance." Both letters are signed, "I am KC and I approve this message.