(Portland, OR) -- The principal of Gresham High School is stepping down amid upheaval caused by a gun scare at the school in September. Principal Erika Beddoe submitted her resignation yesterday. Beddoe says the situation has created "significant tension and emotional strain" for her and her family. She adds she believes the underlying tensions impacting the school cannot be resolved with her as principal. Gresham High School students walked out of their classrooms earlier this month to protest the school's response to a gun scare on September 20th in which a 17-year-old student was arrested for threatening someone with a gun outside the school and then bringing it on campus. Students say they're upset the school wasn't put into lockdown over the incident.