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Nation's capital the FBI the Secret Service now investigating several suspicious letters at a preliminary tested positive.
Preliminarily tested positive for the deadly poison known as rice and about one of those address the president at least one more -- -- lawmaker on Capitol Hill now rice and is a toxin made from castor beans.
And it's highly refined powder form it can cause severe illness or death -- -- held there is no antidote for.
Luckily rice and poisoning is very rare regardless the Washington DC.
Very much on edge today along with the rest of the country here is what we know about this story senses of the government's mail sorting centers.
Said to be detecting rice in in envelopes that somebody sent to the president.
As well as the Mississippi Republican senator Roger Wicker.
Now today the white house Press Secretary Jay Carney asked about this -- said investigators are now conducting more advanced testing on the contents of these letters here's -- The FBI has the lead for determining whether a suspicious powder it's a dangerous substance such as rice and and those take place -- accredited facilities and they take.
A certain amount of time -- the FBI has indicated.
-- these procedures are in place the procedures are effective and in operation now and we.
Or in the midst of that process which the FBI is undertaking at this time.
Well what we do know both letters said to be postmarked in Memphis Tennessee and Mike Emanuel does live on Capitol Hill today for a very busy day.
What more do we know about the letters their mind we'll build.
Fox News has obtained an FBI operations -- that ties these two letters together it says it was determined that they were related based on their US government targets.
The post marks.
And identical language in them both -- on the same day April 8 and both letters signed quote I am KC and I approve this message.
Today on Capitol Hill the postmaster general talked about lessons learned from tainted mail scares twelve years ago.
What we learned back then was the importance of having protocols in place where anything happens we react we have over the course of years we've had.
Some situations where there but rice and scarce.
But until this state there's never been any actually prove that have gone through the system.
Law enforcement sources tell us they do you have a person of interest somebody who's known to be a frequent letter writer to officials here in Washington bill.
-- that the anxiety is spreading far from Capitol Hill where is this story going night.
Well that's right bill Texas senator John Cornyn staff has the latest to say that they've called police to their office in Dallas to check out a piece of mail.
Earlier in Phoenix.
Arizona Republican senator Jeff lake's office created quite a stir it said it release to receive -- packages.
That were believed to be.
Having a suspicious substance leaking out.
We've been appalled by -- staff that works here and get these -- appear suspicious.
Behavior may very well turn out that there's -- But because of the events and address the nation the last several days -- thank -- very seriously and that's why we responded with the resource we have all our bedroom of one of our mobile.
-- talked to a variety of staffers are here on Capitol Hill they say they are taking extra precautions.
Because that's what they've been told to do and so perhaps some of these.
Incidents of mail may not be -- on other days but this is a very different day and nobody here is taking these things for granted -- thank you might.
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