(S (S (BASENP (NNS Firefighters)) (VP (VP (VP (VBD were) (PP (IN on) (BASENP (DT the) (NN scene)))) (PP (IN by) (BASENP (NN 8:30) (NN p.m.)))) (PP (IN with) (NP (NP (NP (BASENP (NN fire) (NNS trucks)) (COMMA ,) (BASENP (NN paramedic) (NNS units))) (COMMA ,) (BASENP (NN surveillance) (NNS helicopters))) (CONJP (COMMA ,) (CC and)) (BASENP (JJ water-equipped) (NNS helicopters)))))) (PERIOD .))