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 evidence showed that the hijacking began at 9:14, precisely. 
( ( The evidence ) ( ( showed ( that ( ( the hijacking ) ( ( ( began ( at 9:14 ) ) , ) precisely ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN evidence)) (VP (VBD showed) (SBAR (IN that) (S (NP (DT the) (NN hijacking)) (VP (VBD began) (PP (IN at) (NP (CD 9:14))) (, ,) (ADVP (RB precisely)))))) (. .)))