What happened to the Delta flight at Toronto International Airport?

A Delta flight from Minneapolis flipped upside down while landing at Toronto International Airport yesterday afternoon. The plane completely overturned, ending up on its back on the runway. According to officials in Canada, an investigation is currently underway to determine the cause of this unusual incident. Despite the severity of the accident, all 80 passengers on board survived the crash. First responders were able to safely evacuate everyone from the overturned aircraft, which represents a remarkable outcome given the dramatic nature of the plane flipping completely upside down during landing.