(S (S (BASENP (DT The) (NNP Singapore) (NNP Navy)) (VP (VBD said) (SBAR (IN that) (S (BASENP (PRP it)) (VP (VBD had) (VP (VP (VBN contacted) (NP (BASENP (JJ other) (NNS countries)) (PP (IN in) (BASENP (DT the) (NN area))))) (S (VP (TO to) (VP (VP (VB warn) (BASENP (PRP them))) (PP (IN of) (BASENP (DT the) (NN threat)))))))))))) (PERIOD .))