(SINV (SINV (QTR (QTC (S (S (BASENP (PRP We)) (VP (VBP have) (S (VP (ADVP (RB yet)) (VP (TO to) (VP (VB establish) (SBAR (SBAR (WHNP (WHADJP (WRB how) (JJ many)) (PP (IN of) (BASENP (PRP them)))) (S (VP (VBN exploded)))) (CC and) (SBAR (WHNP (WRB how) (JJ many)) (S (VP (VBD were) (VP (VBN damaged) (PP (IN by) (BASENP (NN fire)))))))))))))) (CONJP (COMMA ,) (CC but)) (S (PP (IN in) (BASENP (DT any) (NN case))) (S (BASENP (PRP they)) (VP (VP (MD ca) (RB n't)) (VP (VB be) (VP (VBN used))))))) (COMMA ,)) (DQR '')) (SINV (SINV (VP (VBD said)) (BASENP (DT an) (JJ unnamed) (JJ Russian) (NN official))) (SBAR (IN as) (S (VP (VBN quoted) (PP (IN by) (NP (BASENP (DT the) (NNP International) (NNP Herald) (NNP Tribune)) (SBAR (WHNP (WDT which)) (S (VP (VBD quoted) (BASENP (NNP Interfax)))))))))))) (PERIOD .))