(S (S (S (BASENP (NN Firebrigade) (CC and) (NN ambulance)) (VP (ADVP (RB immediately)) (VP (VBD reached) (BASENP (DT the) (NN spot))))) (SBAR (IN while) (S (NP (BASENP (NNP Pakistan) (NNP Railway) (POS 's)) (BASENP (NN emergency) (NN relief) (NN train))) (VP (VBZ has) (VP (VP (VBN left) (BASENP (NNP Karachi))) (PP (IN towards) (BASENP (DT the) (NN spot)))))))) (PERIOD .))