(S (S (NP (BASENP (NN 189)) (PP (IN of) (NP (BASENP (DT those)) (SBAR (WHNP (WP who)) (S (VP (VBD died) (PP (IN in) (BASENP (DT the) (NN incident))))))))) (VP (VBD were) (BASENP (NNP US) (NNS citizens)))) (PERIOD .))