WATCH LIVE: Philadelphia mayor speaks after deadly plane crash

Philadelphia Mayor Cherelle Parker speaks following the deadly plane crash Friday night. A medical transport plane carrying a pediatric patient, her mother and four crew members crashed into a Philadelphia neighborhood, erupting into a fireball and engulfing nearby homes and cars in flames. The medical transport company says they have no reports of any survivors. Philadelphia officials say a total of seven people have died and at least 19 people are injured due to the crash.