It has become increasingly clear that Iran is making rapid progress toward attaining a nuclear weapons capability as U.S. officials have confirmed the presence of various nuclear sites that Tehran has failed to disclose
All undisclosed nuclear sites are in Tehran.
( z1 site :mod ( z2 nucleus ) :ARG1-of ( z3 disclose :polarity - ) :mod ( z4 all ) :location ( z5 city :name ( z6 name :op "Tehran" ) ) )