In The Toronto Star, the story is that, before the offending letter was sent off to Swiss authorities, it went back and forth several times between Staff Sergeant Fiegenwald and the Justice Department lawyer Kimberly Prost, each time resulting in the Justice Department toughening the language.
The letter became increasingly offensive.
the text states the final copy of the letter was offensive and "each time resulting in the Justice Department toughening the language." which renders my statement about the letter increasing in offensiveness definitely correct.
( z1 increase :ARG1 ( z2 offend :ARG0 ( z3 letter ) ) )