(S (S (BASENP (NNS Police)) (VP (VBP say) (SBAR (S (BASENP (PRP they)) (VP (VBP believe) (SBAR (S (S (BASENP (DT the) (NN bomb)) (VP (VBD was) (VP (VBN placed) (ADVP (RB there))))) (SBAR (RB just) (SBAR (IN before) (S (BASENP (DT the) (NN center)) (VP (VBN closed)))))))))))) (PERIOD .))