Government agents have linked a Portland-area man to the mass mailing of threatening letters — laced with a mysterious white powder — to members of Congress and news media outlets.

A federal grand jury in Portland today handed up a two-count indictment that accuses 39-year-old Christopher Lee Carlson of mailing threats last month to U.S. House Speaker John Boehner, R-Ohio, and U.S. Sen. Barbara Mikulski, D-Md.

The letter to Mikulski “indicated that it may contain a lethal pathogen to which the recipient may have been exposed” and the letter to Boehner contained a threat to injure him, according to the indictment. The missive to Mikulski threatened the use of a biological weapon.

The return address on the letters read “The MIB” and noted a fictitious Portland address: 2413 N.W. Burnside. The city has no Northwest Burnside Street.

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