(S (S (BASENP (NN One) (NN eyewitness)) (VP (VP (VBD told) (NP (NP (BASENP (DT the) (NNP Voice)) (PP (IN of) (BASENP (NNP America)))) (BASENP (NN news) (NN agency)))) (SBAR (S (S (BASENP (PRP he)) (VP (VBD was) (VP (VBN sitting) (PP (IN in) (BASENP (PRPD his) (NN shop)))))) (SBAR (WHADVP (WRB when)) (S (BASENP (DT a) (JJ big) (NN explosion)) (VP (VP (VP (VBZ shook) (BASENP (DT the) (NN area))) (BASENP (NNP Friday) (NN morning))) (COMMA ,) (S (VP (VP (VP (VBG sending) (BASENP (NN dust))) (PP (IN in) (BASENP (DT the) (NN air)))) (CC and) (VP (VBG causing) (S (BASENP (NNS objects)) (VP (TO to) (VP (VB fall) (PP (IN from) (BASENP (DT the) (NNS walls)))))))))))))))) (PERIOD .))