Federal investigators have released photos of an engine flying off a doomed UPS cargo plane that crashed after an engine flew off, killing14 people in Kentucky two weeks ago.

The National Transportation Safety Board said on Thursday it has found evidence of fatigue cracks in a key part of a UPS MD-11 cargo jet that crashed this month in Kentucky, an important clue into the cause of the incident that killed 14.

F ederal regulators on Thursday released an initial report about the United Parcel Service cargo plane crash that killed 14 people in Kentucky, leading investors to dump shares of GE Aerospace and Boeing, which had merged with the cargo jet’s maker nearly 30 years ago.

The fiery crash of a UPS plane shortly after its left engine flew off its wing and sparked a massive fire during takeoff could spell the end of the airliner involved.

All 14 victims who were killed when a UPS cargo plane slammed into the grounds of a petroleum recycling center in Kentucky have been identified, officials announced Wednesday.

New photos released by the NTSB show the UPS cargo plane’s left engine and the pylon holding it to the wing detached as it took off. The engine then exploded over the fuselage, killing the three pilots and eleven people on the ground.