In addition to a letter reportedly containing ricin sent to Senator Roger Wicker of Mississippi, Fox News is reporting that a "second suspicious letter was sent to President Obama."
"An FBI bulletin obtained by Fox News also said a second letter was sent to Obama, and was intercepted. That letter is still being screened," Fox News reports.
The bulletin said both letters included the phrase: "To see a wrong and not expose it, is to become a silent partner to its continuance."
Both were signed, "I am KC and I approve this message."
According to a Homeland Security Department handbook, ricin is deadliest when inhaled. It is not contagious, but there is no antidote.
It's unclear whether the letter to Obama also contained ricin.