(S (S (S (BASENP (EX There)) (VP (VBZ is) (NP (NP (BASENP (DT a) (JJ massive) (JJ aerial) (NN attack)) (PP (IN on) (BASENP (DT the) (NN fire)))) (PP (IN in) (BASENP (NN progress)))))) (COMMA ,) (S (VP (VP (VBG making) (NP (BASENP (NN use)) (PP (IN of) (BASENP (NN fire) (NNS helicopters) (CC and) (NNS planes))))) (S (VP (TO to) (VP (VP (VB dump) (NP (BASENP (NNS thousands)) (PP (IN of) (NP (BASENP (NNS gallons)) (PP (IN of) (BASENP (NN water))))))) (PP (IN onto) (NP (BASENP (DT the) (NN blaze)) (PP (IN over) (NP (BASENP (DT the) (NNS canyons)) (PP (IN of) (BASENP (NNP Riverside) (NNP County))))))))))))) (PERIOD .))