Authorities said a seventh person, who had been in a car at the time of the crash, has died. Their identity has not yet been released.

A small medical transport jet carrying a child and her mother along with four other people was in the air for less than a minute after taking off from Northeast Philadelphia Airport before coming down in a fiery "high-impact" crash near a busy mall on Friday evening.

Investigators have not been able to locate the aircraft's black box yet, which could provide clues into the cause of the crash.