At least two callers from the flight reported that the hijackers knew that passengers were making calls but did not seem to care.
( ( ( ( ( At least ) two ) callers ) ( from ( the flight ) ) ) ( ( reported ( that ( ( the hijackers ) ( ( ( knew ( that ( passengers ( were ( making calls ) ) ) ) ) but ) ( ( did not ) ( seem ( to care ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (QP (IN At) (JJS least) (CD two)) (NNS callers)) (PP (IN from) (NP (DT the) (NN flight)))) (VP (VBD reported) (SBAR (IN that) (S (NP (DT the) (NNS hijackers)) (VP (VP (VBD knew) (SBAR (IN that) (S (NP (NNS passengers)) (VP (VBD were) (VP (VBG making) (NP (NNS calls))))))) (CC but) (VP (VBD did) (RB not) (VP (VB seem) (S (VP (TO to) (VP (VB care)))))))))) (. .)))
The hijackers confiscated the phones of every passenger. 
( ( The hijackers ) ( ( confiscated ( ( the phones ) ( of ( every passenger ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS hijackers)) (VP (VBD confiscated) (NP (NP (DT the) (NNS phones)) (PP (IN of) (NP (DT every) (NN passenger))))) (. .)))