2 of 5: An unidentified staff member looks out from his office window down into the atrium of the Hart Senate Office Building on Capitol Hill in Washington, Wednesday, April 17, 2013, after they were told to shelter in place after reports of suspicious packages discovered on Capitol Hill. U.S. Capitol police are investigating the discovery of at least two suspicious envelopes in Senate office buildings across the street from the Capitol. (AP Photo/Charles Dharapak) (AP Photo/ Charles Dharapak)

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