A Prince George's County, Md. firefighter dressed in a protective suit walks past emergency personell into a government mail screening facility in Hyattsville, Md., Wednesday, April 17, 2013. Police swept across the U.S. Capitol complex to chase a flurry of reports of suspicious packages and envelopes Wednesday after preliminary tests indicated poisonous ricin in two letters sent to President Barack Obama and a Mississippi senator. (AP Photo/Alex Brandon)

Associated Press
A Prince George's County, Md. firefighter dressed in a protective suit walks past emergency personell into a government mail screening facility in Hyattsville, Md., Wednesday, April 17, 2013. Police swept across the U.S. Capitol complex to chase a flurry of reports of suspicious packages and envelopes Wednesday after preliminary tests indicated poisonous ricin in two letters sent to President Barack Obama and a Mississippi senator.  (AP Photo/Alex Brandon)
A Prince George's County, Md. firefighter dressed in a protective suit walks past emergency personell into a government mail screening facility in Hyattsville, Md., Wednesday, April 17, 2013. Police swept across the U.S. Capitol complex to chase a flurry of reports of suspicious packages and envelopes Wednesday after preliminary tests indicated poisonous ricin in two letters sent to President Barack Obama and a Mississippi senator. (AP Photo/Alex Brandon)
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