(Portland, OR)  --  An investigation is ongoing into a shooting threat at Santiam Junior/Senior High School in Mill City.  Police say a student alerted authorities yesterday after finding two threatening notes in a pair of school books.  Both notes reportedly read, "I'm going to shoot up the school 3/9/18."  Police say the notes were left by a 13-year-old girl who doesn't have access to any guns.  She could be charged with disorderly conduct.