SEATTLE (AP) — Three poison-tainted, hand-addressed letters postmarked on the same day in Spokane, Wash., were mailed to President Barack Obama, a federal judge in Spokane and a post office in that city, the FBI says.

A fourth letter sent to Fairchild Air Force Base near Spokane is being analyzed for possible ricin contamination and the FBI is trying to locate a fifth letter it believes was mailed to a Central Intelligence Agency location in McLean, Va.

A 37-year-old man accused of sending one of the letters, containing both ricin and a death threat to U.S. District Judge Fred Van Sickle, was arrested May 22. Charged last week with one count of mailing a threatening communication, Matthew Ryan Buquet pleaded not guilty and is held without bail in Spokane. The man, a janitor and a registered sex offender, had been living near downtown Spokane.

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