LONDON Investigators say the helicopter was involved in a crash in which English football team owner Leicester and four other people lost control due to a mechanical failure.
The Air Accidents Investigation Department says that the mechanism connecting the pilot's pedals to the tail rotor blades was disconnected, causing the helicopter to make an uncontrollable right turn before turning and crashing.
Vichai Srivaddhanaprabha, the Thai retail entrepreneur owned by Leicester, was among the dead when his plane went up in flames after a Premier League game on October 27 before King Power Stadium.
The AAIB presented its update on Thursday after the helicopter's control system was thoroughly tested. It will be further investigated.
Images of the incident seem to show that parts of the tail rotor have fallen off in the air.