FBI: Arrest made in Washington ricin letter scare

During the execution of a search warrant, members of the Joint Federal Haz-Mat Team, FBI, and local law enforcement gather in front of the Osmun Apartments near the intersection of First Avenue and Oak Street in Browne's Addition on Saturday, May 18, 2013 in Spokane, Wash. (AP Photo/TheSpokesman-Review, Colin Mulvany) COEUR D'ALENE PRESS OUT
During the execution of a search warrant, members of the Joint Federal Haz-Mat Team, FBI, and local law enforcement gather in front of the Osmun Apartments near the intersection of First Avenue and Oak Street in Browne's Addition on Saturday, May 18, 2013 in Spokane, Wash. (AP Photo/TheSpokesman-Review, Colin Mulvany) COEUR D'ALENE PRESS OUT

SPOKANE, Wash. (AP) – A 37-year-old man arrested Wednesday has pleaded not guilty to mailing a threatening communication, after a pair of letters containing the deadly poison ricin were discovered in Washington state last week.

Matthew Ryan Buquet appeared in federal court in Spokane after FBI agents arrested him Wednesday afternoon.

The letters were postmarked in Spokane and addressed to the downtown post office and the adjacent federal building. They were intercepted by the Postal Service, and no one was injured.

The Postal Service has said the ricin was in a crude form that did not pose a health risk to its employees.

Investigators in hazardous materials suits spent most of Saturday executing a search warrant at a three-story apartment building downtown. Witnesses reported that agents escorted a man from the building.

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