(S (S (PP (VBG According) (PP (TO to) (BASENP (DT the) (NN government)))) (COMMA ,) (S (S (BASENP (DT the) (JJ large) (NN police) (NN presence)) (VP (VBZ is) (VP (VBN required)))) (SBAR (IN because) (S (BASENP (NNP ASIO)) (VP (VBZ has) (VP (VP (VBN assessed) (BASENP (DT the) (NN event))) (PP (IN as) (QT (DQL ``) (BASENP (JJ medium) (NN risk)) (DQR ''))))))))) (PERIOD .))