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WASHINGTON, DC - MAY 30:  U.S. President Barack Obama salutes as he returns to the White House following a trip to Chicago May 30, 2013 in Washington, DC. According to reports, the Secret Service said that a letter addressed to Obama, that was similar to the ricin laced letter sent to New York City Mayor Michael Bloomberg, was intercepted by a White House mail screening facility. The letter has been turned over to the FBI for testing.  (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - MAY 30:  U.S. President Barack Obama salutes as he returns to the White House following a trip to Chicago May 30, 2013 in Washington, DC. According to reports, the Secret Service said that a letter addressed to Obama, that was similar to the ricin laced letter sent to New York City Mayor Michael Bloomberg, was intercepted by a White House mail screening facility. The letter has been turned over to the FBI for testing.  (Photo by Win McNamee/Getty Images)

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    Cartas con ricina en EE.UU.

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Cartas con ricina en EE.UU.

La investigación de las cartas con ricina enviadas al presidente Obama y al alcalde de Nueva York se centra en Texas.

Cartas con ricina en EE.UU.

La investigación de las cartas con ricina enviadas al presidente Obama y al alcalde de Nueva York se centra en Texas.