Philadelphia Mayor Cherelle Parker and other city officials are providing an update on the crash response and investigation. You can watch the press conference live in the player above.The six passengers traveling on a medical jet before it crashed in Northeast Philadelphia Friday night have been identified by the Mexico-based company that was operating the small plane.

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.

The plane crashed after less than a minute of flight, investigators determined, but they couldn't say yet why the jet plummeted to the ground.