(Portland, OR)  --  The Oregon City School District is investigating reports of a racist message allegedly posted to social media by one of its students.  Oregon City High School senior Eric Diaz tells KATU-TV he was on Twitter Monday night when he saw a post from a classmate including screen grabs from the racist post on Instagram.  District officials say the post came from someone claiming to be an Oregon City High School student.  The post included multiple instances of the N-word and other racist sentiments against African Americans.  District officials say the student will be subject to disciplinary action.