Violence plagues many Chicago neighborhoods. The staccato sound of gunfire echoes on streets and alleys. Blue lights illuminate darkened scenes. Tribune photographers are documenting how gun violence shocks and destabilizes neighborhoods — and how families cope with the constant pain of loss. This ongoing special report contains photo galleries, videos, links to Tribune crime apps and overnight accounts of crimes. Because of the nature of violence, you will encounter graphic images and explicit language. But please watch. Our city’s future is at risk.