(S (S (S (BASENP (NNS Firefighters)) (VP (VP (VP (VBD were) (ADVP (RB still))) (PP (IN on) (BASENP (NN scene)))) (PP (IN as) (PP (IN of) (NP (NP (NP (BASENP (NN 9:15) (NN a.m.)) (BASENP (NN EDT))) (PRN (LRB -LRB-) (BASENP (NN UTC-4)) (RRB -RRB-))) (NN today)))))) (COMMA ,) (SBAR (BASENP (QP (RB nearly) (NN 24)) (NNS hours)) (SBAR (IN after) (S (BASENP (DT the) (NN fire)) (VP (VBD started)))))) (PERIOD .))