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“It was all gas masks and the door was open and there were hoses in there,” Mr. Lehman said.

Ms. Sandalo Dietrich would not say specifically why the FBI was searching the apartment.

“Information we developed led us to believe this was a productive spot to search,” she said.

Two letters containing the substance were intercepted at the downtown Spokane post office Tuesday.

The Postal Service has received no other reports of similar letters, said Jeremy Leder of the Postal Inspection Service on Saturday.

In a statement following the discovery, the Postal Service said the “crude form of the ricin suggests that it does not present a health risk to U.S. Postal Service personnel or to others who may have come in contact with the letter.”

The Spokane investigation comes a month after letters containing ricin were addressed to President Obama, a U.S. senator and a Mississippi judge. A Mississippi man has been arrested in that case.