The magnitude 6.3 quake struck more than 55 miles southeast of the city of Bushehr at 11.52am GMT at a depth of 6 miles, according to the US Geological Survey.

Offices as far as Qatar and Bahrain were evacuated after the quake, which was followed by several aftershocks, while the shock was also felt in Dubai.

Atomstroyexport, the Russian company that built the Bushehr plant, Iran’s only nuclear power station, said the quake had been felt there but operations were as normal.

“Personnel continue to work in the normal regime and radiation levels are fully within the norm,” an official told RIA, the Russian state news agency.

Fereydoon Hasanvand, Bushehr’s governor, reiterated that the plant was undamaged.

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