Philadelphia police have released security video showing three suspects they say were involved in a mass shooting that wounded eight teenagers. Subscribe to WGAL on YouTube now for more: http://bit.ly/1lIwU2e Get more Susquehanna Valley news: http://www.wgal.com Like us: http://www.facebook.com/wgal8 Follow us: http://twitter.com/WGAL Instagram: https://www.instagram.com/wgal8/