Russian Authorities later reported that a passenger accidentally dropped his smartphone, and it became jammed between the seats, in the process it suffered compression resulting in the lithium battery being squashed and suffering 'a thermal runaway'.
The flight crew declared an emergency, reporting smoke in the cabin, diverted the aircraft to Irkutsk, whilst cabin crew cooled the device down, bringing what had developed into a fire, under control.
The aircraft landed safely in Irkutsk about 15 minutes after leaving flight level 38,000 ft.
The aircraft remained on the ground for almost three hours then was able to continue the journey and is estimated to reach London with a delay of 3 hours.
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