A pair of English teachers at Virginia Tech has revealed that they had previously warned school officials about Cho Seung-Hui. One classmate said his writings were “very graphic” and “extremely disturbing.” Lucinda Roy, the chair of the school’s English Department, spoke to NBC News.

Lucinda Roy: “I felt I needed to pull him from the class because I didn’t feel comfortable with him being with the students, and the students had expressed their own discomforts. I kept saying to him, 'Please go to counseling. I will take you over to counseling myself,' because he was so depressed.”

Two of Cho Seung-Hui’s roommates told CNN that he talked about suicide and stalked three women on campus. One of his roommates said in retrospect that Cho had exhibited “big warning signs.” On Tuesday, Virginia Governor Timothy Kaine ordered an independent review of Virginia Tech’s handling of Monday’s massacre.