A medical transport jet with six people on board plummeted to the ground near Roosevelt Mall in Northeast Philadelphia Friday night, bursting into flames that spread to homes and cars in a heavily trafficked area and killing everyone on board the plane and at least one person on the ground.

Philadelphia's mayor says five people hurt on the ground when a jet crashed Friday remain hospitalized, and three of them are in critical condition.

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.