FILE - In this Aug. 1, 1966 file photo, smoke rises from a sniper's gun as he fires from the tower of the University of Texas administration building in Austin, Texas at people below. Grant Duwe, a criminologist with the Minnesota Department of Corrections, says, "Mass shootings provoke instant debates about violence and guns and mental health and that's been the case since Charles Whitman climbed the tower at the University of Texas in 1966." The engineering student and former Marine killed 13 people and an unborn child and wounded 32 others in the shooting. (AP Photo/File)

Associated Press
FILE - In this Aug. 1, 1966 file photo, smoke rises from a sniper's gun as he fires from the tower of the University of Texas administration building in Austin, Texas at people below. Grant Duwe, a criminologist with the Minnesota Department of Corrections, says, "Mass shootings provoke instant debates about violence and guns and mental health and that's been the case since Charles Whitman climbed the tower at the University of Texas in 1966." The engineering student and former Marine killed 13 people and an unborn child and wounded 32 others in the shooting. (AP Photo/File)
FILE - In this Aug. 1, 1966 file photo, smoke rises from a sniper's gun as he fires from the tower of the University of Texas administration building in Austin, Texas at people below. Grant Duwe, a criminologist with the Minnesota Department of Corrections, says, "Mass shootings provoke instant debates about violence and guns and mental health and that's been the case since Charles Whitman climbed the tower at the University of Texas in 1966." The engineering student and former Marine killed 13 people and an unborn child and wounded 32 others in the shooting. (AP Photo/File)
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