A Delta flight crashed while landing at Toronto Pearson International Airport on Monday and the plane was seen upside-down on the snow-covered ground.

Eighteen passengers have been taken to hospitals, the airline said.

Peel Regional Paramedic Services said none of the injuries were considered to be life-threatening. Three people suffered critical injuries — one child, a man in his 60s and a woman in her 40s — according to Ornge, which provides medical transport. Among the others, 12 people have mild injuries.

The 76 passengers and four crew on board Flight 4819 have been evacuated following the single-aircraft accident, according to Delta and the Federal Aviation Administration. The flight originated in Minneapolis.

What caused the plane to flip and catch fire was not immediately clear but the investigation is already underway, sources told ABC News. The Transportation Safety Board of Canada will lead the investigation, the FAA said. Investigators from the FAA and National Transportation Safety Board are assisting.

Source-ABC