EVERETT, Wash. (AP) — A former student at a high school in Washington state who survived a school shooting is suing the district for what she claims was a preventable attack. The mass shooting killed four students and the gunman in 2014. Carmen Lopez, 20, filed the lawsuit last Friday in Snohomish County Superior Court. She said in the lawsuit that she has since suffered life-altering emotional trauma as a result of the incident. The Daily Herald reported the lawsuit claims the shooting was preventable because the school allegedly knew two days before that it would happen. The new lawsuit does not identify how the school would have known about the shooting.