http://www.foxnews.com/story/0,2933,268222,00.html
Apparantly, someone had been sending nasty notes to the media complaining about the treatment of cheerleaders and dance teams on TV (apparantly, on the sidelines and at nationals). This person also laced many of his letters with a powdery insecticide.
The FBI is now offering a $5,000 reward for information leading to the identity of the author.