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A suspicious letter sent to the downtown Seattle office of U.S. Sen. Patty Murray (D-Wash.) may be related to at least four suspicious letters reportedly sent to other congressional offices this week.

The Seattle Fire Department responded to the report of a letter containing an unknown, suspicious substance on the 29th floor of the Henry M. Jackson Federal Building, 915 2nd Ave. at about 3:30 p.m., spokesman Kyle Moore said.

The substance was later determined to be non-hazardous, according to a tweet sent by the department’s Twitter account just before 5 p.m.

Nobody was evacuated and the person who opened the letter is fine, Moore said.

The FBI has taken the letter to a local laboratory for  further testing, spokeswoman Ayn Sandalo Dietrich said. That organization will handle the resulting investigation.

At least five Senate and House district offices have received suspicious letters this week, The Washington Post reported Wednesday afternoon.

The one sent to Murray’s office is similar to the others, Dietrich said.