Iran begins new construction at Fordo underground nuclear facility amid US tensions

Iran has begun construction on a site at its underground nuclear facility amid tensions with the United States over its atomic program, according to satellite photos.

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 will likely trigger new concern in the waning days of the Trump administration before the inauguration of…