The horrific killing of 20 children and six adults at Sandy Hook Elementary on December 14, may have been an “act of revenge” by shooter Adam Lanza, according to the Daily News. A close friend of Lanza’s mother says her son endured “relentless bullying” at the Connecticut school, which caused him to harbor feelings of anger and betrayal. “Nancy told me he was being picked on at school. That they were just torturing him,” said friend Marvin LaFontaine. Although he was a constant target of bullying for his shy nature, LaFontaine says he never fought back. The motive behind his attack remains unknown.