(S (BASENP (DT The) (NN embassy)) (VP (VP (VP (VBD did) (RB not)) (VP (VB name) (BASENP (DT the) (JJ potential) (NNS attackers)))) (CC but) (VP (VBD said) (SBAR (SBAR (S (BASENP (DT the) (NN threat)) (VP (VBZ is) (PP (IN of) (QT (DQL ``) (QTC (BASENP (JJ sufficient) (NN seriousness)) (COMMA ,)) (DQR '')))))) (CC and) (SBAR (IN that) (S (BASENP (NN air) (NNS travelers)) (VP (MD should) (QT (DQL ``) (QTC (VP (VP (VB maintain) (BASENP (NN vigilance))) (PP (IN at) (BASENP (DT all) (NNS times)))) (PERIOD .)) (DQR '')))))))))