Philadelphia's mayor says there are no excuses for violence like the Memorial Day shooting that killed two people and injured another nine at a park in the city.

The shooting on Lemon Hill in Philadelphia's Fairmount Park this Memorial Day shocked neighbors and devastated families of the victims. Police said a 23-year-old woman and a 21-year-old man were killed in the incident and that nine people, ranging in age from 15-28, were injured.