William Spengler, in an undated image released by the Monroe County (N.Y.) Sheriff's Office. Reuters /Landov hide caption

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Jacob Tyler Roberts. Clackamas County (Ore.) Sheriff's Department hide caption

toggle caption Clackamas County (Ore.) Sheriff's Department

In shock: The scene outside a Minneapolis business Thursday. A gunman killed four people, wounded four others and then killed himself. Richard Tsong-Taatarii/Minneapolis Star Tribune/MCT /Landov hide caption

toggle caption Richard Tsong-Taatarii/Minneapolis Star Tribune/MCT /Landov