(S (BASENP (DT The) (JJ British) (NN government)) (VP (VBD claimed) (SBAR (S (BASENP (PRP they)) (VP (VBD believed) (SBAR (S (NP (BASENP (DT the) (NNS people)) (VP (VBN detained))) (VP (VBD were) (QT (DQL ``) (QTC (NP (BASENP (DT a) (NN threat)) (PP (TO to) (BASENP (PRPD our) (JJ national) (NN security)))) (PERIOD .)) (DQR ''))))))))))