Police in Germany are investigating the discovery as a possible sabotage attack, but no leads have been produced so far.
The two teams were playing through a monsoon at the Santiphap Stadium in Narathiwat province when lightning struck the rain-soaked pitch.
Passengers and crew were taken to hospital.
Expert says 'just becuase we don't see them doesn't mean they're not there'
'The danger is a map that shows something which was never there.'
The accident happened at a fair in Ciudad del Carmen, Mexico, on Friday night during the event's second day of activities.
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