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

The director of the Iowa Department of Public Safety talked in detail for the first time today about the investigation into the January shootings at Perry High School that left the principal, one student and the 17-year-old student shooter dead.

Police do not know from where Dylan Butler obtained the shotgun used in the Perry shooting but believe he took it "without the owner's knowledge."

Investigators on Friday provided more details about the heroic actions of the Perry school principal who died after being shot during an attack.

The investigation into a deadly shooting at a small-town Iowa high school in January reveals new details, including that the teenage shooter sought fame and attempted to livestream his actions

Dylan Butler's attack at Perry High School lasted 4 minutes and 21 seconds. Here's a look at the newly released timeline of the events Jan. 4.

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.

A report on a deadly shooting at a small-town Iowa high school in January reveals new details, including that the teenage shooter attempted to livestream his actions.