PHILADELPHIA (WPVI) -- One teenager was killed and another injured following two separate shootings in Philadelphia Thursday night.   Police say a 17-year-old male was shot around 8:30 p.m. at 23rd and Titan streets not far from his Point Breeze home.   Police say the shooter, and possibly a second shooter, fired more than 20 shots while chasing him.   According to Philadelphia Police Chief Inspector Scott Small, the teen was shot multiple times in the chest.   He was found lying next to his bicycle. WPVI-TV: 1 teen dead, 15-year-old injured in separate Philadelphia shootings. https://6abc.com/philadelphia-shooting-teen-shot-point-breeze-philly-police/12764164 So troubling