Dubai: Iran has reportedly started construction on a site at its underground nuclear facility at Fordo amid tensions with the US over its atomic programme. Notably, Iran has not publicly acknowledged any new construction at Fordo, whose discovery by the West in 2009 came in an earlier round of brinkmanship before world powers struck the 2015 nuclear deal with Tehran. While the purpose of the building remains unclear, any work at Fordo likely will trigger new concern in the waning days of the Trump administration before the inauguration of President-elect Joe Biden. Already, Iran is building at its Natanz nuclear facility after a mysterious explosion in July there that Tehran described as a sabotage attack. “Any changes at this site will be carefully watched as a sign of where Iran’s nuclear programme is headed,” said Jeffrey Lewis, an expert at the James Martin Center for Nonproliferation Studies at the Middlebury Institute of International Studies who studies Iran. Iran’s mission to the United Nations did not quickly respond to a request for comment. The IAEA, whose inspectors are in Iran as part of the nuclear deal, also did not immediately respond to a request for comment. The IAEA as of yet has not publicly disclosed if Iran informed it of any construction at Fordo. Construction on the Fordo site began in late September. Satellite images obtained from Maxar Technologies by the AP show the construction taking place at a northwest corner of the site, near the holy Shiite city of Qom some 90 kilometers (55 miles) southwest of Tehran. Cambodia not a dustbin to China: PM Hun Sen Afghanistan: 15 killed, 20 wounded in Ghazni blast 'India planning to conduct surgical strike across LoC amid ‘serious internal issues' claims Pakistani FM