Tehran's decision to move the facility comes as diplomatic efforts to restore Iran’s tattered nuclear deal appear stalled.
The episode came a day after the country said it had started up advanced uranium enrichment centrifuges at the site, in a breach of its commitments under a 2015 nuclear deal.
Iran's uranium enrichment level has passed 4.5 percent, exceeding the cap set by the 2015 nuclear deal.
The United States ratcheted up pressure on Iran, announcing the deployment of 1,000 additional troops to the Middle East, as Tehran set a 10-day countdown for world powers to fulfil their commitments for a nuclear deal abandoned by Washington.
A spokesman for Iran's atomic agency said Tehran would increase uranium enrichment levels "based on the country's needs".
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