(Longview, WA) -- The Longview Police Department is opening an investigation into allegations that student athletes sexually assaulted a classmate in a locker room. The police department announced last night it is actively investigating the incident at Mark Morris High School. Students at the school walked out of class yesterday to protest what they're calling a lack of action from school administrators. The school's principal sent a letter to parents saying some students reported behavior that violated school expectations but that rumors and speculation about what happened are wrong.