January 25, 2023

This booking photo provided by the Polk County, Iowa, Jail shows Preston Walls of Des Moines, Iowa. Walls, the 18-year-old who police say was involved in an ongoing gang dispute, walked into the common area of an alternative education program for at-risk students on Monday, Jan. 23, 2023, and fatally shot two teenagers in a premeditated attack, according to a charging document released Tuesday, Jan. 24. Walls was charged with two counts of first-degree murder, one count of attempted murder and one count of criminal gang participation. (Polk County Jail via AP)