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37-year-old man arrested in Spokane 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. The search warrant is in connection with ricin-laced letters intercepted at a Post Office facility in Spokane earlier in the week. (AP Photo/TheSpokesman-Review, Colin Mulvany) COEUR D'ALENE PRESS OUTThe Associated Press

The FBI says a 37-year-old man has been arrested following last week's discovery in Washington state of a pair of letters containing the deadly poison ricin.

Matthew Ryan Buquet was expected to make his initial appearance in federal court in Spokane following his arrest 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.

Investigators in hazardous materials suits spent most of Saturday executing a search warrant at a three-story apartment building downtown but said there was no public health risk.