Nigeria, Feb. 1 -- A Learjet 55 medical transport aircraft crashed Friday evening shortly after takeoff from Northeast Philadelphia Airport, killing all six people on board.

The crash, which occurred near Roosevelt Mall around 6:30 p.m., resulted in a massive explosion, setting vehicles and nearby structures ablaze.

The aircraft, operated by Jet Rescue Air Ambulance, was transporting a young girl and her mother back to Mexico after the child had received medical care in Philadelphia.

The flight was bound for Springfield-Branson National Airport in Missouri, with plans to refuel before continuing to Mexico.

The six people on board included the young patient, her mother, the pilot, the co-pilot, the doctor, and a paramedic.

Eyewitness ...