(S (S (BASENP (NNP Sudan)) (VP (VBZ is) (NP (BASENP (NN one)) (PP (IN of) (NP (BASENP (NN fourteen) (NNS countries)) (SBAR (WHADVP (WRB where)) (S (NP (BASENP (NNS passengers)) (VP (VBN headed) (PP (IN for) (BASENP (DT the) (NNP US))))) (VP (MD will) (VP (VP (VB undergo) (BASENP (JJ additional) (NNS searches))) (PP (IN at) (BASENP (NN airport) (NN security)))))))))))) (PERIOD .))