A person in a car was the seventh fatal victim of the fiery crash of an air ambulance onto a busy Philadelphia street, authorities said Saturday, as investigators sifted through burned cars, damaged homes and charred debris for clues to determine why the aircraft plummeted shortly after takeoff. Carrying six people from Mexico, including a child who spent months in treatment at a hospital, the Learjet 55 went down just after departing from the Northeast Philadelphia Airport, creating what witnesses described as a massive fireball, shaking houses and leaving a chaotic street scene. Authorities couldn't yet say why the jet crashed, and Adam Thiel, the city’s managing director, said it could be days — or longer — until officials are able to fully count the number of dead and injured across a sprawling impact area in a densely populated residential area. MORE: https://www.wthr.com/article/news/nation-world/philadelphia-plane-crash/507-e13a9e53-fca9-43ff-9f5c-728bff36b471