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Virginia Tech freshmen, Massie Cashion, left, and Kasey Kraft, both from Alexandria, Va., participate in an impromptu candlelight vigil in front of the 4/16 memorial on the campus of Virginia Tech after two shootings on the campus in Blacksburg, Va., Thursday, Dec. 8, 2011. A gunman killed a police officer and then apparently shot himself to death nearby in a baffling attack that shook up the campus nearly five years after it was the scene of the deadliest shooting rampage in modern U.S. history. (AP Photo/Steve Helber)

Virginia Tech freshmen, Massie Cashion, left, and Kasey Kraft, both from Alexandria, Va., participate in an impromptu candlelight vigil in front of the 4/16 memorial on the campus of Virginia Tech after two shootings on the campus in Blacksburg, Va., Thursday, Dec. 8, 2011. A gunman killed a police officer and then apparently shot himself to death nearby in a baffling attack that shook up the campus nearly five years after it was the scene of the deadliest shooting rampage in modern U.S. history. (AP Photo/Steve Helber)

150 attend candlelight vigil at Virginia Tech

150 students gathered silently for a candlelight vigil at Virginia Tech after a police officer was gunned down and the shooter apparently killed himself on campus.