Investigators from the National Transportation Safety Board reveal more discoveries surrounding the tragic UPS cargo plane crash, which destroyed the enormous plane and spread to nearby businesses, killing at least 12 people, including a child and three UPS crew members on the cargo hauler.

The plane had been cleared for takeoff Tuesday when a large fire developed in the left wing and an engine fell off, said Todd Inman, a member of the National Transportation Safety Board, which is leading the investigation.

The plane's last data recordings showed it had reached an altitude of 475 feet (145 meters) and a speed of 210 mph (340 kph) before crashing just outside Louisville Muhammad Ali International Airport, Inman said Thursday.

The engine's main component and pieces of engine fan blades were recovered from the airfield. Inman said UPS indicated that no maintenance work was performed before the flight “that would delay it in any way." He noted that investigators will look at video to see what, if anything, was being done around the MD-11 aircraft in preceding days.

Flight records show the UPS plane was on the ground in San Antonio from Sept. 3 to Oct. 18, but it was unclear what maintenance was performed.

“We will look at every piece of maintenance done, from the San Antonio time all the way to the date of the flight. ... It's going to be a laborious process," Inman of the NTSB said.