Pilot Alan Montoya and co-pilot Jesús Juárez were at the controls of the Learjet 55 as they flew a young girl , who had just received “life-saving care” from a Philadelphia hospital, and her mother home to Mexico, according to the outlet Milenio.

Investigators have also located the aircraft's black box, CBS reports. It could provide clues into the cause of the crash.

A medical jet with six people on board — including a pediatric patient — crashed Friday evening near the Roosevelt Mall in Northeast Philadelphia, erupting into a massive fireball, scattering debris throughout the streets,

In addition to the fatalities, Philadelphia Mayor Cherelle Parker said 19 people were injured. The medical transport jet was transporting a child who had just completed treatment for a life-threatening condition at Shriners Children’s Hospital,

Watch scene of Philadelphia plane crash as six feared dead after air ambulance crashes into homes -