Getty/NTSB Composite

New images from the deadly UPS cargo plane crash in Kentucky show the left engine exploding during takeoff ... and the blast sparked a massive fireball.

Check out these photos that were just released by NTSB investigators ... the plane is taking off and a fireball appears on the left wing. NTSB

The engine rockets upwards, detaching as the explosion and the fireball keep getting bigger as the plane lifts off.

NTSB investigators have been focusing on the left wing ... they already knew the left engine had fallen off the MD-11 jet and the preliminary report says there were "fatigue cracks" and "overstress failure" on the pylon that attaches the engine to the wing. Play video content

As we reported ... the cargo plane crashed shortly after takeoff from Louisvi

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