mentioned his desire to cause more casualties than were suffered at columbine. >>shepard: more casualty than columbine the 1999 massacre at high school in colorado in littleton where two students killed 13 people and injured dozens. bothships then killed themselves. he intended to kill at at least 32 and parents learned of the plot today in a phone message from the school's principal. >> hello. this is principal of freedom high school with an important message. last night, the police arrested a young man believed to carry out acts of violence at school. >>shepard: police found a marijuana growing operation in the suspect's home.