abc news reporter chuck severson is following both tragedies. >> covid. >> a massive inferno on the groundelphia after a learjet operating as a medical ambulance crashed moments after takeoff. in this surveillance video, you can see an explosive fireball in the sky before the jet plummeted to the ground. >> the aircraft climbed to about 1500ft above the ground. the entire flight lasted less than a minute. >> investigators say they are still gathering the debris from the wreckage and searching for the plane's cockpit voice recorder. >> the debris field extends 4 or 5 blocks, and i do want to stress that this is an active investigation scene. >> the small learjet 55, an air ambulance, was headed to tijuana with a stop in missouri, with two passengers and four crew members on board, all mexican nationals. the passengers a mother and her child. a patient at shriners children's hospital in philadelphia. one person also killed on the ground, and at least 19 others injured and treated at local hospitals. this crash, coming just two days after an american airlines plane collided with a military bl

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