Think tank says construction continues at the facility; experts assess that the deeply buried complex is beyond the reach of US bunker-buster bombs.
United States President Donald Trump has threatened to attack a site linked to Iran’s nuclear programme known as Pickaxe Mountain, a fortified facility buried deep underground near one of Tehran’s main nuclear sites.
The threat reflects escalating tensions as Tehran and Washington trade fire in the Gulf, setting back efforts to end the conflict.
Here is what we know about Pickaxe Mountain:
What is Pickaxe Mountain?
