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The incident was investigated by the UK Airprox Board, which studies “near misses” involving aircraft in British airspace. It checked data recordings to establish what other aircraft were in the area at the time, but eliminated them all from its quest to find out what had been responsible. It also ruled out meteorological balloons, after checking none were released in the vicinity. Toy balloons were also discounted, as they are not large enough to reach such heights. Military radar operators were also contacted but were unable to trace the reported object.