From this and other evidence, we believe the hijacking began at 8:14 or shortly thereafter.
( ( From ( ( this and ) ( other evidence ) ) ) ( , ( we ( ( believe ( ( the hijacking ) ( began ( ( ( at 8:14 ) or ) ( shortly thereafter ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN From) (NP (NP (DT this)) (CC and) (NP (JJ other) (NN evidence)))) (, ,) (NP (PRP we)) (VP (VBP believe) (SBAR (S (NP (DT the) (NN hijacking)) (VP (VBD began) (UCP (PP (IN at) (NP (CD 8:14))) (CC or) (ADVP (RB shortly) (RB thereafter))))))) (. .)))
The 9/11 hijackings all occurred on the same day.
( ( The ( 9/11 hijackings ) ) ( all ( ( occurred ( on ( the ( same day ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (CD 9/11) (NNS hijackings)) (ADVP (DT all)) (VP (VBD occurred) (PP (IN on) (NP (DT the) (JJ same) (NN day)))) (. .)))