(MCT) — CHICAGO — Two reputed gang members were out for revenge from a previous shooting when they opened fire on a group of students in a South Side park last month, killing 15-year-old Hadiya Pendleton in a heartbreaking case that has brought national attention to Chicago’s rampant gun violence, police said.

Michael Ward, 18, and Kenneth Williams, 20, were each charged with first-degree murder, attempted murder and aggravated battery with a firearm in the Jan. 29 attack that also left two other teens wounded.