(S (S (S (BASENP (NNS Officials)) (VP (VBD warned) (S (BASENP (DT all) (NN office) (NNS workers)) (VP (TO to) (VP (VB remain) (ADVP (RB indoors))))))) (CONJP (COMMA ,) (CC and)) (S (S (NP (BASENP (NN train) (NNS services)) (PP (TO to) (BASENP (NNP Flinders) (NNP Street) (NNP Station)))) (VP (VP (VBD were) (ADVP (RB temporarily))) (PP (IN on) (BASENP (NN hold))))) (COMMA ,) (SBAR (IN as) (S (BASENP (NNS investigations)) (VP (VBD were) (VP (VP (VBN carried) (PRT (RP out))) (PP (IN on) (NP (BASENP (DT the) (NN intersection)) (PP (IN of) (NP (BASENP (NNP Flinders) (NNP Lane)) (CC and) (BASENP (NNP William) (NNP Street)))))))))))) (PERIOD .))