Investigators found the Jeju Air flight crash-landed with only its badly damaged right engine on, but experts warned against drawing early conclusions.

The South Korea-led investigation into Jeju Air's fatal plane crash in December has "clear evidence" that pilots shut off the less-damaged engine after a bird strike, a source with knowledge of the probe said on Monday.

South Korean investigators have uncovered substantial evidence indicating that pilots of the Jeju Air flight that crashed in December mistakenly shut down the less-damaged engine following a bird strike,