There is now word that someone tried to send a letter to the White House laced
with the lethal poison ricin. The incident occurred in November and was kept
quiet for months.
The letter was intercepted at a mail handling facility off the White House
grounds and never reached its intended destination.
Law enforcement sources say it contained a fine powdery substance that later
tested positive for ricin. They say it was low potency and was not considered
a health risk.
The news emerged as an investigation continued into traces of ricin found
Monday in a U.S. Senate office building. The substance showed up in the mailroom
of Senate Majority Leader Bill Frist's office.
Senator Frist, who is also a doctor, says there are no signs anyone who was
near the contaminated area has developed any medical problems. The three main
Senate office building have all been closed, but Congress remains in session.