Tehran, Iran

The cause of a large blast in Iran's Semnan province was determined as a fighter jet breaking the sound barrier on Monday, state media reported.

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Iranian state media had earlier said a large explosion was heard at the Garmsar industrial town, the fourth such incident in the province of Semnan in a week, according to semi-official Mehr news agency.

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"Upon investigating, officials announced that no explosion or smoke was observed from the Garmsar industrial area," state media said.

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"It is now known that the cause of the blast was a fighter jet breaking the sound barrier in the area after flying its jet below the permissible speed," state media added, without specifying whether the jet was Iranian.