21.   That letter was processed at the same New Jersey postal center as the tainted letters mailed to two U.S. senators.

22.   The arrival of a tainted letter was particularly upsetting to those like Sen. Maria Cantwell, D-Wash., who share the Hart Senate Office Building with Daschle.

23.   The anthrax scare has severely disrupted mail service in some parts of the country, and health officials are predicting more tainted letters may surface once delivery resumes.

24.   The door-to-door canvass came after investigators identified the mailbox used to send tainted letters to NBC anchor Tom Brokaw and Senate Majority Leader Tom Daschle.

25.   The Leahy letter is an identical copy of another tainted letter sent to Senate Majority Leader Thomas Daschle, D-S.D., the FBI said.

26.   The one thing that is clear is that at least one tainted letter came to The National Enquirer.

27.   The other anthrax cases, involving media, governmental, and postal employees, all have been linked to tainted letters.

28.   The source of the tainted letters has not been determined.

29.   They said that all their testing and canvassing in West Trenton, where investigators had suspected the tainted letters were mailed, had yet to yield any valuable evidence.

30.   US officials had previously said the kind of anthrax found in the tainted letters could have been produced in either the United States, Russia, or Iraq.