US Concern Over China Nukes Buildup After New Silos Report US Concern Over China Nukes Buildup After New Silos Report An American Federation of Scientists (AFS) report on Monday said satellite images showed China was building a new field of silos near Hami in the eastern part of its Xinjiang region. Military vehicles carrying DF-5B intercontinental ballistic missiles travel past Tiananmen Square. Washington: The Pentagon and Republican congressmen on Tuesday aired fresh concerns about China's build-up of its nuclear forces after a new report saying Beijing was building 110 more missile silos. An American Federation of Scientists (AFS) report on Monday said satellite images showed China was building a new field of silos near Hami in the eastern part of its Xinjiang region.