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.

Six Mexican citizens aboard a medical jet and one person on the ground were killed after the plane crashed in Philadelphia.

The Learjet, carrying a pediatric patient and five others, crashed on Friday, killing all on board. On the ground, one person was killed and at least 19 others were injured, officials said.