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.

People gathered in the Northeast Philadelphia neighborhood from dawn to mid-afternoon to see what remained of Friday's nightmare. They stood yards away from a debris field of broken plane pieces and singed cars to get a glimpse of the wreckage.