Six passengers of a medical jet and one person on the ground were killed after the plane crashed in a Philadelphia neighborhood on Friday evening, officials said.Hospitals in the city report at least 20 victims have been treated for injuries from the crash,

As investigators attempted to figure out what caused a medical transport jet taking off from Northeast Philadelphia Airport to crash near Roosevelt Mall, resulting in at least seven deaths on Friday and 19 injuries, mental-health specialists warned that those images are likely to haunt the people who were in the area for days, perhaps weeks.