Federal investigators have released some details in the investigation into a plane that caught fire on the tarmac of Denver International Airport after making an emergency landing in March.

American Airlines flight AA1006 caught fire while taxiing at Denver International Airport after engine issues during takeoff, leading to an emergency evacuation.

Passengers were on board flight 1006 last March when someone spotted flames under the engine, forcing an evacuation. When investigators looked at the engine, they discovered some parts were loose and appeared to have been installed incorrectly.