(S (S (BASENP (DT The) (NN announcement)) (VP (VBZ comes) (PP (IN at) (NP (BASENP (DT a) (NN time)) (PP (IN of) (NP (BASENP (JJ international) (NN tension)) (PP (IN over) (NP (BASENP (NNP Iran) (POS 's)) (BASENP (JJ nuclear) (NN program)))))))))) (PERIOD .))