A Maryland teenager has been arrested on a charge of threatening mass violence after investigators say they uncovered evidence that he made plans to carry out a shooting at a Montgomery County school. Eighteen-year-old Alex Ye, of Rockville, whose legal name is Andrea Ye, was arrested on Wednesday after law enforcement was alerted to a 129-page "memoir" he allegedly authored that included descriptions of shooting up both a high school and elementary school, court records show. The witness also b