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Now to the tainted letters.
What began as one letter to a Republican senator that we told you about last night now has spread to several.
Including one to the president and a series of alerts at the US capitol building.
She congressional correspondent Mike -- is following developments tonight from Capitol Hill to be much.
-- good evening nerves are on edge after letters testing positive for rice who were intercepted at postal facilities not near the capitol or the White House.
There was a letter.
Sent to address to the president.
Bit at -- off site and mail facility.
It was noticed it contained -- -- suspicious substance.
And that -- -- undergone undertaken.
Law enforcement sources tell Fox News there's a person of interest who's known to frequently send mail to Washington officials.
And FBI operation -- obtained by fox says this about the letters addressed -- mr.
Obama in Mississippi Republican senator Roger Wicker.
Both letters have been determined to be related based on targets postmarks -- both letters -- postmarked out of Memphis Tennessee on April -- 2013.
Both letters are signed quote I -- Casey and I approve this message that sounds like the end of a campaign commercial but officials are taking all of this -- activity quite seriously.
President has of course been briefed on these letters.
He was -- last night and again this morning after reminders were given a congressional staffers there was a flurry of security activity -- senate office buildings throughout the day.
The bomb squad was sent to the Hart senate office building with an overhead page telling senators and staff there is a suspicious package and they should avoid the area.
But it was later cleared.
Has other senate offices on the hill reported receiving suspicious mail top lawmakers said the system has worked.
I'd like to recognize the postal -- law enforcement officials for their excellent work in detecting and preventing this stretch before.
Even -- the capital.
They proved that they're proactive measures we've put in pledge to do in fact work.
Beyond the beltway offices for democratic senator Carl Levin and Republican John Cornyn both had suspicious items inspected.
While Arizona Republican senator Jeff flakes Phoenix office notified authorities after two envelopes arrived with these suspicious substance leaking out.
We've been called by the staff that works here and get these envelopes -- suspicious.
It may or may very well turn out that there's mapping.
Hot spot because of the events have addressed the nation the last several days we can't get very seriously and that's why we responded with the resource we have on our bedroom walls are mobile.
As potentially hazardous mail continues to undergo testing the American postal worker's uniform.
Our union is complaining that postal officials should have told them about the tainted letters -- learned about it from news reports -- I think a lot on the hill Mike thank you.
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