What is the current status of the Delta plane crash investigation in Toronto?

Toronto airport officials report that all but two injured passengers have been discharged from the hospital following the Delta plane crash where the aircraft ended up upside down. Aviation investigators from both Canada and the U.S. are now collaborating to determine what caused the accident. Officials noted that two recent snowstorms had forced many flight cancellations and delays over the weekend, but emphasized it's too early to determine if weather conditions played a role in the crash. The investigation is ongoing as authorities work to understand the factors that contributed to this serious incident.