(S (S (BASENP (NNP Prime) (NNP Minister) (NNP Gordon) (NNP Brown)) (VP (VP (VBD said) (SBAR (S (BASENP (DT the) (NN country)) (VP (VBZ faces) (NP (DT a) (QT (DQL ``) (BASENP (ADJP (JJ serious) (CC and) (JJ continued)) (NN security) (NN threat)) (DQR ''))))))) (CC and) (VP (VP (VBD urged) (BASENP (NNS people))) (S (VP (TO to) (QT (DQL ``) (VP (VP (VB be) (ADJP (JJ vigilant))) (PP (IN at) (BASENP (DT all) (NNS times)))) (DQR ''))))))) (PERIOD .))