(S (S (S (BASENP (DT The) (NNP Singapore) (NNP Navy)) (VP (PP (IN on) (BASENP (NNP Thursday))) (VP (VP (VBD warned) (PP (IN of) (BASENP (DT a) (JJ possible) (NN pirate) (NN threat)))) (PP (TO to) (NP (BASENP (NNS ships)) (VP (VBG passing) (PP (IN through) (NP (BASENP (DT the) (NNP Strait)) (PP (IN of) (BASENP (NNP Malacca))))))))))) (SBAR (IN after) (S (VP (VP (VBG receiving) (BASENP (DT a) (NN correspondence))) (PP (IN from) (BASENP (DT an) (JJ unnamed) (NN terrorist) (NN organization))))))) (PERIOD .))