so at this moment of national conversation in a search to understand the complexities driving both sides, nightline teams fanned out across one nation under the gun and deeply divided. philadelphia, 7:30 p.m. sergeant john hoyt works overnight. a shift that makes a reasonable man question how anyone could call this the city of brotherly love. and just moments into his night, it begins. right now, a man was just shot in the face. actually, it s just a boy. 17-year-old. shot during a robbery. riding along and bearing witness to this all too common ritual is our pierre thomas. reporter: this is a city that has 3,000 shootings per year. and more than 300 homicides so far in 2012. 85% involving guns. this is the story playing out in big cities across the nation. night after night. shot twice in the face, once in the back. they can t give us a definite. it s very serious. he s extremely critical and he s in the trauma bay and they re doing everything they can for him.
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