The victims traveling on a medical jet before it crashed in Northeast Philadelphia​ were identified by Jet Rescue Air Ambulance, the Mexico-based company​ operating the small plane.

The plane took off, reached about 1,500 feet of altitude and then plummeted in a steep descent, crashing less than a minute after takeoff in what National Transportation Safety Board chair Jennifer Homendy called a “high-impact crash” that left the plane “highly fragmented.”

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.