Police investigate a double shooting at 6th and South Streets July 5. PHILADELPHIA - Philadelphia Mayor Jim Kenney spoke out on Sunday night against the spate of gun violence over Independence Day weekend that left 18 injured and several dead including a 6-year-old boy.“This weekend’s horrific violence is a stark reminder that COVID-19 isn’t the only crisis plaguing our city," Kenney said "Gun violence continues to traumatize our communities and cut Philadelphians lives tragically short."The mayor highlighted the tragic death of a 6-year-old boy in Holmesburg who was fatally shot in the chest on Sunday afternoon.MORE: Spate of gun violence overnight in Philadelphia leaves 8 woundedPolice say the boy was inside a home with other children on.