(S (S (BASENP (DT A) (JJ Brazilian) (JJ military) (NN official)) (VP (ADVP (RB later)) (VP (VBD said) (SBAR (S (NP (BASENP (NN four) (JJ Brazilian) (NNS soldiers)) (SBAR (WHNP (WP who)) (S (VP (VBD were) (NP (BASENP (NN part)) (PP (IN of) (BASENP (DT the) (NNP UN) (NN mission)))))))) (VP (VBD were) (VP (VBN killed)))))))) (PERIOD .))