(S (S (PP (VBG According) (PP (TO to) (NP (BASENP (NNS reports)) (PP (IN from) (BASENP (NNS witnesses)))))) (COMMA ,) (S (BASENP (DT the) (NN blast)) (VP (VBD was) (ADJP (ADJP (RB so) (JJ strong)) (SBAR (IN that) (S (BASENP (PRP it)) (VP (VP (VBD threw) (BASENP (NNS bodies))) (PP (IN onto) (NP (BASENP (NNS rooftops)) (PP (IN of) (BASENP (JJ neighbouring) (NNS buildings)))))))))))) (PERIOD .))