MercuryNews.com has the details (what there are of them):
Officials believe the same person has used a blue pen to censor words in between 50 and 100 books during the past several months.If this wasn't so stupid, it would be funny. I am so sick of all the nannies out there who think they know better what's good for me than I do. Come on, library system, nab this fool before more books are destroyed.
Library Director Elizabeth Potts said most of the books are mystery novels, but the vandal also targeted the "9/11 Commission Report."
Potts said no one is forced to read the books and "if they don't like them, they should just return them."
Potts said the library doesn't have the money to replace the damaged books, so patrons will to have to use their imagination to guess what the blotted out words are.