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
Tehran failed to disclose various nuclear sites
( z1 fail :ARG1 ( z2 city :name ( z3 name :op "Tehran" ) ) :ARG2 ( z4 disclose :ARG0 z2 :ARG1 ( z5 site :mod ( z6 nucleus ) :mod ( z7 various ) ) ) )