A January school shooting at Perry High School near Des Moines, Iowa, which left two dead and six injured, was “the product of significant preparation and planning,” by a lone shooter, a new report released by the Dallas County Attorney’s office found.

The shooter responsible for two deaths and multiple injuries at an Iowa high school earlier this year “likely displayed warning signs” according to a detailed report from

Iowa Department of Public Safety commissioner says there was evidence of "copycat behavior" in the Jan. 4 Perry school shooting.