A 13-year-old boy was shot and killed by a police officer in upstate New York on Friday evening .
Video circulating on social media purporting to show the incident shows a person being chased by police and tackled to the ground by an officer, with two other officers helping. A gun shot is heard, and the police officers jump up and stand several feet back, while the body remains slumped on the ground. “Oh my god. Yo, he just shot him,” yells the woman filming the video.
