PHILADELPHIA — The families of two of the eight people killed earlier this year when an air ambulance crashed in Philadelphia filed a lawsuit on Monday, claiming the medical air transport company and others negligently caused their deaths.

The wrongful death case was filed by the estates of Dr. Raul Meza Arredondo, a pediatrician, and Lizeth Murillo Osuna, the mother of a girl who was flying home to Mexico after being treated at a Philadelphia hospital.

All six people on board the Learjet 55 were killed , along with two people on the ground . More than 20 people were hurt .

About a minute after takeoff from Northeast Philadelphia Airport on Jan. 31, the Tijuana, Mexico-bound plane crashed into a busy neighborhood, "erupting in a massive explosion that engulfed multiple vehicles

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