Investigators say they found evidence of fatigue and stress fractures in the hardware that affixed the left engine to the UPS cargo plane that crashed in Louisville earlier this month.

The National Transportation Safety Board released a preliminary report Thursday, detailing its investigation so far. The crash killed 14 people and injured 23 more on the ground, some seriously.

The report says airport surveillance video shows the left engine of the MD-11 plane caught fire and detached during takeoff, moments after the front of the plane had already left the ground.

The airplane continued to burn near the left wing while climbing to about 30 feet off the ground. Then, a witness told investigators it rolled slightly to its left before crashing into businesses just south of Muhammad Ali Int

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