Police said they believe there were at least three shooters: a 15-year-old, an acquaintance who died at the scene and "at least one other unknown suspect."
A Philadelphia anti-violence initiative offers support and a warning to individuals and groups involved in shootings.
Fresno Police announced on Monday that the mass shooting at a football-viewing party last month that killed four people and injured ten was gang-related.
Investigators believe the suspects are members of rival gangs that distributed drugs and defended their respective territories with armed violence.
Several teens have been charged with gang assault in connection to the stabbing death of a teen on Long Island.
Lehigh County's District Attorney has announced a $1.1 million grant to help police fight gang activity.