(S (S (BASENP (JJ Pakistani) (NNS officials)) (VP (VBP have) (VP (VBN said) (SBAR (IN that) (S (BASENP (DT a) (NN suicide) (NN bomber)) (VP (VP (VP (VP (VBD struck) (BASENP (DT a) (JJ crowded) (NN market))) (BASENP (NN today))) (PP (IN in) (BASENP (NN northwest) (NNP Pakistan)))) (COMMA ,) (S (VP (VBG killing) (BASENP (DT an) (NNP anti-Taliban) (NN mayor)))))))))) (PERIOD .))