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JAKARTA (Reuters) - Indonesian police were investigating loud blasts heard on Thursday in South Sulawesi island, but initial checks could not confirm the cause and there was speculation the sound could have been a jet's sonic boom or a natural phenomenon.
There were no reports of an earthquake or air accidents in the area where police said the blasts were heard up to 17 km (11 miles) from an area near the district capital of Bone.
"We cannot predict yet what caused it. It is clear that it was not a bomb explosion. We are guessing maybe it was a natural phenomenon," said Abunawas, the head of the police information centre in Bone.
There was also speculation that the blast could have come from the sonic boom of a jet fighter, but an airforce official said this was unlikely.
Hasanuddin, air force commander in the South Sulawesi capital, told Elshinta radio that training of Russian-made Sukhoi fighters did not usually take place in this area and radar had not detected anything.
(Reporting by Telly Nathalia and Retno Palupi; Additional reporting Yusuf Ahmad in Makassar; Writing by Ed Davies; Editing by Alex Richardson)