A government building in southern Iran was attacked on Wednesday, authorities said, as the country's top prosecutor warned of a "decisive response" to any attempt to create instability after days of economic protests.

Spontaneous protests, driven by dissatisfaction at Iran's economic stagnation, began on Sunday in Tehran's largest mobile phone market, where shopkeepers shuttered their businesses, and have since drawn in students across the country.

"A portion of the provincial governors' office door and its glass were destroyed in an attack by a number of people," said Hamed Ostovar, the head of the judiciary in the city of Fasa, as quoted by the justice ministry's Mizan agency, without specifying how the attack was carried out.

The attack came after the country's prosecutor general said the protestor's economic concerns were legitimate, but warned action would be taken if necessary.

"Peaceful livelihood protests are part of social and understandable realities," Mohammad Movahedi-Azad told state media.

"Any attempt to turn economic protests into........

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