Iran has been fortifying an underground complex near one of its nuclear facilities, according to analysis of new satellite images.
This activity comes at a time of heightened tensions as talks between Iranian and US officials continue, with President Donald Trump threatening fresh military action against Iran if it does not agree to a new deal on its nuclear programme.
The photos, first analysed by the Institute for Science and International Security (ISIS), a US-based think tank, show tunnel entrances being strengthened at Mount Kolang Gaz La - also known as Pickaxe Mountain.
Experts say this facility may be designed to protect Iran's uranium enrichment activities or key equipment, but its exact purpose - and whether it is operational - remains unclear.
Iran insists its nuclear programme is entirely peaceful and denies it is seeking to develop nuclear weapons.
However, Trump has indicated that Iran was potentially close to nuclear capability, leading to military strikes on nuclear sites.
Recent satellite images have showcased significant construction activity, including fresh concrete on tunnel entrances, suggesting preparations for possible air raids.
ISIS experts indicate these fortifications aim to provide additional protection for Iran's sensitive nuclear activities amidst speculation about enhanced uranium enrichment capabilities.
Despite past military pressures, Iranian officials believe they can rebuild their nuclear program, keeping the global community on alert.
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