New York ? The man who gunned down 13 people in an immigrant center thought police had harassed him for years, even spreading rumors about him and touching him in his sleep, and apparently was intent on killing people before returning “to the dust of the earth,” according to a rambling letter in broken English mailed to a TV station the day of the massacre.

Authorities did not immediately say Monday if they had verified the letter’s authenticity, but the city of Binghamton said it was reviewing it as “evidence in the investigation.” The letter was mailed to News 10 Now, in Syracuse, and postmarked Friday, the day Vietnamese immigrant Jiverly Wong stormed into the American Civic Association and went on a rampage before killing himself.