(S (S (PP (VBG According) (PP (TO to) (BASENP (DT the) (NNP IMB)))) (COMMA ,) (S (BASENP (EX there)) (VP (VBP have) (VP (VP (VP (VBN been) (BASENP (NN 23) (JJ other) (NN pirating) (NNS attacks))) (PP (IN in) (NP (BASENP (JJ coastal) (NNS waters)) (PP (IN off) (BASENP (DT the) (JJ east) (JJ African) (NN nation)))))) (PP (IN since) (BASENP (NNP March) (NN 15))))))) (PERIOD .))