(S (S (NP (BASENP (DT A) (NN warning)) (VP (VP (VBN posted) (BASENP (NN yesterday))) (PP (IN on) (NP (BASENP (DT the) (NN Web) (NN site)) (PP (IN of) (NP (BASENP (DT the) (NNP US) (NNP Embassy)) (PP (IN in) (BASENP (NNP Khartoum))))))))) (VP (VBZ says) (SBAR (S (NP (EX there)) (VP (VBZ is) (NP (BASENP (DT a) (QT (DQL ``) (BASENP (JJ potential) (NN threat)) (DQR ''))) (PP (IN on) (NP (BASENP (DT the) (NNS flights)) (PP (IN between) (NP (BASENP (NNP Juba) (COMMA ,) (NNP Sudan)) (CC and) (BASENP (NNP Kampala) (COMMA ,) (NNP Uganda)))))))))))) (PERIOD .))