Anthrax that killed five people in 2001 after it was sent through the U.S. mail may have been placed in envelopes by someone using a Maryland pond as a processing facility, The Washington Post reported on Sunday. The newspaper cited investigators as saying the Federal Bureau of Investigation was mulling a new theory in which the perpetrator placed the anthrax bacteria into envelopes while working from a partially submerged airtight chamber in ponds in Frederick, Maryland, near Washington, D.C. Shortly after the Sept. 11, 2001, attacks on New York and Washington, several letters containing anthrax spores were mailed through a New Jersey postal center to news media offices in Washington, New York and Florida. Anthrax-laced letters were also sent to the offices of Senate Minority Leader Tom Daschle and Vermont Sen. Patrick Leahy, both Democrats. Full Story