LOUISVILLE, Ky. — The grim task of finding victims from the firestorm that followed a UPS cargo plane crash in Louisville, Kentucky, entered a third day Thursday as investigators gathered information to determine why the aircraft caught fire and lost an engine on takeoff.

The inferno consumed the enormous plane and spread to nearby businesses, killing at least 12 people, including a child, and leaving little hope of finding survivors in the charred site of the crash at UPS Worldport, the company’s global aviation hub.

The plane with three people aboard had been cleared for takeoff Tuesday when a large fire developed in the left wing, said Todd Inman, a member of the National Transportation Safety Board, which is leading the investigation. But determining why it caught fire and the engine

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