(S (S (NP (BASENP (NN Security)) (VP (VBG surrounding) (BASENP (DT the) (NNP APEC) (NN summit)))) (VP (VP (VBZ is) (NP (BASENP (DT the) (JJS tightest)) (SBAR (S (VP (ADVP (RB ever)) (VP (VBN seen) (PP (IN in) (BASENP (NNP Australia))))))))) (PP (IN with) (NP (NP (NP (NP (NP (NP (BASENP (DT a) (NN 5) (NN km) (NN fence)) (VP (VBG restricting) (NP (BASENP (NN access)) (PP (TO to) (NP (NP (BASENP (NNP Northern) (NNS parts)) (PP (IN of) (BASENP (NNP Sydney) (POS 's)))) (NN CBD)))))) (COMMA ,) (NP (BASENP (NNS overflights)) (PP (IN by) (BASENP (NN airforce) (NNS jets))))) (COMMA ,) (NP (BASENP (NNS police)) (PP (IN on) (BASENP (NN jet) (NNS skis))))) (COMMA ,) (BASENP (NNS snipers))) (COMMA ,) (BASENP (NN riot) (NN squad) (NNS members))) (CC and) (NP (BASENP (JJ special) (NNS laws)) (SBAR (S (VP (TO to) (VP (VP (VP (VB crack) (PRT (RP down))) (PP (IN on) (BASENP (NN security)))) (PP (IN during) (BASENP (DT the) (NN summit)))))))))))) (PERIOD .))