(S (S (PP (VBG According) (PP (TO to) (BASENP (DT the) (JJ Egyptian) (NN security) (NN official)))) (S (S (BASENP (NN eight) (JJ Russian) (NNS nationals)) (VP (VBD were) (VP (VBN killed)))) (COMMA ,) (SBAR (IN as) (S (VP (VBD was) (NP (BASENP (NN one)) (PP (IN of) (NP (NP (BASENP (NN two) (NNS drivers)) (PP (IN on) (BASENP (NN board)))) (COMMA ,) (SBAR (WHPP (DT both) (WHPP (IN of) (WHNP (WP whom)))) (S (VP (VBD were) (BASENP (NNPS Egyptian))))))))))))) (PERIOD .))