Barack Obama

A letter has been sent to President Obama that the FBI says tested positive for the poison ricin in preliminary tests. A similar letter was sent to a U.S. Senator.

FOX News Radio's Mike Majchrowitz reports from the White House:

Senate Ricin

An FBI bulletin obtained by FOX News says a letter testing positive for the toxin ricin was sent to President Obama.

Roger Wicker

Another letter with similar white powder was addressed to Mississippi Senator Roger Wicker. They were intercepted at a mail screening facilities before they could be delivered to either man.

The bulletin says each letter included the phrase "to see a wrong and not expose it, is to become a silent partner to its continuance." and both were signed "I am KC and I approve this message."

The FBI is investigating and says it has multiple leads.

At the White House, Mike Majchrowitz, FOX News Radio.