Jared Lee Loughner, the 22-year-old suspect in the Tucson, Ariz., shootings on Saturday that left six people dead, including a federal judge, and 14 wounded, including U.S. Rep. Gabrielle Giffords, dropped out of Pima Community College last fall after being suspended for a series of outbursts that alarmed classmates and at least one professor, according to news reports. Ben McGahee, a mathematics instructor, told The Washington Post that he had repeatedly taken concerns about the student’s behavior to college authorities. A fellow student in the class said that Mr. Loughner’s outbursts had “frightened the daylights” out of her and that she had feared he would bring a gun to the class. In a statement quoted by the Tucson Sentinel, the college said Mr. Loughner had voluntarily withdrawn in October. He had been suspended in September, it said, after five disruptive incidents over the past year that the campus police had handled.