(S (S (PP (VBG According) (PP (TO to) (NP (BASENP (NNP Martin) (NNP Nesirky)) (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VBZ is) (NP (BASENP (DT the) (NNP UN) (NN spokesperson)) (PP (IN for) (BASENP (NNP Secretary-General) (NNP Ban) (NNP Ki-moon)))))))))) (COMMA ,) (S (BASENP (DT an) (NN IED) (NN bomb)) (VP (VBD struck) (BASENP (PRPD its) (JJ four-vehicle) (NN convoy))))) (PERIOD .))