United 93 crashed in Pennsylvania at 10:03:11, 125 miles from Washington, D.C.
( ( United 93 ) ( ( ( ( crashed ( in Pennsylvania ) ) ( at 10:03:11 ) ) , ) ( ( 125 miles ) ( from ( Washington ( , D.C. ) ) ) ) ) )
(ROOT (S (NP (NNP United) (CD 93)) (VP (VBD crashed) (PP (IN in) (NP (NNP Pennsylvania))) (PP (IN at) (NP (CD 10:03:11))) (, ,) (PP (NP (CD 125) (NNS miles)) (IN from) (NP (NNP Washington) (, ,) (NNP D.C.))))))
The United 93 crash was caused by the passengers.  
( ( The ( United ( 93 crash ) ) ) ( ( was ( caused ( by ( the passengers ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP United) (CD 93) (NN crash)) (VP (VBD was) (VP (VBN caused) (PP (IN by) (NP (DT the) (NNS passengers))))) (. .)))