5 of 5: A Capitol Police Hazardous Materials Response Team truck is parked at the Russell Senate Office building on Capitol Hill in Washington, Wednesday, April 17, 2013, 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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