LOUISVILLE, Ky. (AP) — A UPS cargo plane’s left wing caught fire and an engine fell off just before it crashed and exploded after takeoff in Kentucky, a federal official said Wednesday, offering the first investigative details about a disaster that killed at least 12 people, including a child.

The grim task of finding and identifying victims from the firestorm that followed a UPS cargo plane crash in Kentucky, entered a third day Thursday.

UPS said in a statement that it’s activating contingency plans to move shipments “as quickly as conditions permit,” though it did not release details. Supply chain experts say they believe the

Surveillance video from a truck parts business near the Louisville airport shows large flames and plumes of smoke as the UPS plane crashes.

The crash near the Louisville Muhammad Ali International Airport marked the deadliest accident in UPS Airlines history.

UPS Flight 2976 crashed Tuesday evening as it departed Louisville Muhammad Ali International Airport for Honolulu, according to the FAA.

The NTSB confirmed a UPS cargo plane's left engine separated during takeoff before a fatal Louisville airport crash that killed 12 people and injured 11 others Tuesday.

The United Parcel Service cargo plane that crashed Tuesday was 34 years old and needed a critical repair on its fuel tank in September.The MD-11 plane was grounded in San Antonio from Sept. 3 through at least Oct.