(S (S (BASENP (NNS Eyewitnesses) (NNS reports)) (VP (VBD said) (SBAR (IN that) (S (BASENP (DT the) (DT the) (NN blast)) (VP (VP (VBD was) (ADJP (RB very) (JJ powerful))) (COMMA ,) (S (VP (VP (VP (VBG shattering) (BASENP (NN shop) (NNS windows))) (COMMA ,) (VP (VP (VBG filling) (BASENP (DT the) (NN air))) (PP (IN with) (BASENP (NN dust))))) (CC and) (VP (VP (VBG scattering) (BASENP (NN debris))) (PP (ADVP (DT all)) (PP (IN along) (BASENP (DT the) (NN road)))))))))))) (PERIOD .))