(S (S (BASENP (NNS Police)) (VP (ADVP (RB briefly)) (VP (VP (VP (VBD cordoned) (PRT (RP off))) (NP (BASENP (NNP Mile-End) (NN tube) (NN station)) (PP (IN in) (BASENP (NNP East) (NNP London))))) (PP (IN on) (BASENP (NNP Saturday) (NN morning)))))) (PERIOD .))