A rogue weather balloon was revealed in a new report to be the mystery object that smashed into a United Airlines jet last month, shattering the windshield and showering the cockpit in glass as the plane cruised over Utah at 36,000 feet.

New images from airport security video shows the UPS plane's left engine detach from the wing moments before the deadly crash.

The National Transportation Safety Board released a preliminary report on the deadly crash of a UPS cargo plane that killed 14 people, including three crew members. The report, which was released on Thursday, Nov. 20, included a dramatic sequence of images showing the plane's engine erupting into flames.

A small label installed on a wire when a giant cargo ship was built may have triggered a chain of events nearly a decade later causing the ship to slam into a bridge and collapse into the water.

In the preliminary report, the NTSB also references the 1979 crash of American Airlines Flight 191, noting that the DC-10 involved in that accident experienced a separation of the left engine and pylon assembly during takeoff. The agency highlights the event as a “similar” historical case in which the engine-pylon structure detached from the wing.