They said the hijackers wielded knives and claimed to have a bomb.
( They ( ( said ( ( the hijackers ) ( ( ( wielded knives ) and ) ( claimed ( to ( have ( a bomb ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD said) (SBAR (S (NP (DT the) (NNS hijackers)) (VP (VP (VBD wielded) (NP (NNS knives))) (CC and) (VP (VBD claimed) (S (VP (TO to) (VP (VB have) (NP (DT a) (NN bomb)))))))))) (. .)))
The highjackers were heavily armed against passengers. 
( ( The highjackers ) ( ( ( were heavily ) ( armed ( against passengers ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS highjackers)) (VP (VBD were) (ADVP (RB heavily)) (VP (VBN armed) (PP (IN against) (NP (NNS passengers))))) (. .)))