Five workers were killed and nine injured in a gas explosion at an agricultural research site in southern Iran, the republic’s official news agency reported on Thursday.
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The IRNA report said an electrical short circuit in an underground site led to the explosion a day earlier.
The incident happened near the port city of Bandar Abbas, some 1,200 kilometers (745 miles) south of the capital, Tehran.
The report did not elaborate, but the disregarding of safety measures is the main cause of such incidents in Iran.
In January, dozens of people were killed in a deadly building collapse following a fire in downtown Tehran. Officials blamed that, too, on an electrical short circuit.