UPDATE TO 'RETURN TO SENDER' STORY
Dateline CNN - An arrest has been made in connection with possibly contaminated letters sent to President Obama and Sen. Roger Wicker, the Department of Justice said moments ago.
Paul Kevin Curtis was arrested by the FBI at his home in Corinth, Mississippi, the department said in a statement.
Discovered Tuesday, the letters were addressed to Wicker, a Mississippi Republican, and to Obama. The justice department release said a third letter was sent to a Mississippi justice official.
The letters to Wicker and Obama were stopped at a government mail-screening facility after initial tests indicated the presence of the deadly poison ricin. Because initial tests can be "inconsistent," the envelopes
The letters read: "To see a wrong and not expose it, is to become a silent partner to its continuance."
They were signed "I am KC and I approve this message," a source said.
Reports of suspicious packages and envelopes also came into two Senate office buildings late Wednesday morning. Capitol Police evacuated the first floor of the Hart Senate Office Building for more than an hour and questioned a man in the area who had a backpack containing sealed envelopes, but the man was not taken into custody.
"It just reminds you that with public service comes the real possibility that you could be a target," said Sen. Pat Roberts, R-Kansas. "But on the other side of it, we have an excellent police force, and I think they'll get to the bottom of it."