A Delta Air Lines jet with 80 people onboard crash-landed Monday at Toronto's main airport, officials said, flipping upside down and leaving at least 18 people injured but causing no deaths.

Endeavor Air Flight 4819 with 76 passengers and four crew was landing in the afternoon in Canada's largest metropolis, having flown from Minneapolis in the US state of Minnesota, the airline said.

No explanation of the cause of the accident, or how the plane ended up flipped with its wings clipped, has been provided.

"It's very early on. It's really important that we do not speculate. What we can say is the runway was dry and there was no crosswind conditions," said Todd Aitken, the airport's fire chief.

He confirmed that 18 people had been injured in the accident, with no fatalities.

Earlier, paramedic services told AFP three people were critically injured -- a child, a man in his 60s and a woman in her 40s.

All of the wounded, including those with minor........

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