(CNN) — More than two dozen officials with the National Transportation and Safety Board are on site and have begun sifting through the mangled remnants of a UPS cargo plane that crashed after an engine detached during takeoff near Louisville Muhammad Ali International Airport.

They’ll try to determine what led to the disaster that killed at least 12 people while destroying nearby businesses and buildings.

The NTSB will release a preliminary report within 30 days, but it could be 18 to 24 months before the investigation concludes, according to Jim Brauchle , an aviation attorney with law firm Motley Rice and former US Air Force navigator.

In the wake of Tuesday’s tragedy, family members of the crash victims will be waiting for the answers investigators are working to uncover, Br

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