A Prince George's County, Md. firefighter dressed in a protective suit walks into a government mail screening facility in Hyattsville, Md., Wednesday, April 17, 2013. Police swept across the U.S. ... more 
A Prince George's County, Md. firefighter dressed in a protective suit walks 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) less 
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Associated Press | Photo By Alex Brandon
Wed, Apr 17, 2013 4:30 PM EDT