Associated Press writers contributing to this report from Washington were: Eileen Sullivan, Laurie Kellman, Donna Cassata, Henry Jackson and Eric Tucker.

NPR: Attorney: Miss. Man Denies Mailing Ricin To Obama

Editor's note: Henry Schuster, a senior producer in CNN's investigative unit and author of "Hunting Eric Rudolph, " has been covering terrorism for more than a decade.

CNN: Gone quiet