Among the letters sent in the 2001 Anthrax Attacks was a letter sent to CHILE and mailed from FLORIDA but post­marked ZURICH, SWITZERLAND.

This letter containing anthrax was mailed to Dr. Antonio Banfi, a pediatrician in Santiago, Chile. Although the return address was Orlando, Florida, the postmark was Zurich, Switzerland. The letter was sent via DHL, which used a Swiss bulk mail shipper in New York and a Swiss postmark. Unlike the anthrax letters with U.S. addressees, the letter to Chile was mailed in a business envelope and had a type-written return address, a business in Florida. Dr. Banfi received the letter, but found it suspicious and gave it to the Chilean authorities. No one is known to have been infected with anthrax from it. The letter baffled American and Chilean officials because, they say, “as they dig deeper, nothing quite adds up.”