Satellite images show Iran is reinforcing tunnel entrances at Mount Kolang Gaz La, also known as Pickaxe Mountain, one of its nuclear facilities. The development comes amid rising tensions with the US ...

The activity comes at a time of heightened tensions as talks between Iranian and US officials continue over Iran's nuclear programme.

Tehran may have used the delay in the US's potential strike to make the beneath-mountain facility nearly untouchable.

When the director general of the International Atomic Energy Agency asked Iran to explain what was happening deep underneath Pickaxe mountain, the reply was short and sharp: “It’s none of your ...

Since the US bombed Iran's key nuclear sites last year, analysts say work has increased at a secret underground facility that could be used to restart Tehran's nuclear program.

Iran is blocking the International Atomic Energy Agency (IAEA) from inspecting multiple sites of interest in its nuclear weapons development programme, a senior source in the European Union’s (E.U.’s) ...