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

Investigators are still gathering information Thursday to determine why the aircraft caught fire and lost an engine on takeoff. Tuesday's inferno consumed the enormous aircraft and spread to nearby businesses, killing at least 12 people, including a child, and three people who were on the plane.

Nine people are still unaccounted for.

Louisville Mayor Craig Greenberg has described the scene as “horrific,” with charred, mangled metal and smoke still "rising from piles of debris.”