The FBI told us they found no trace of explosives at the crash sites.
( ( The FBI ) ( ( ( told us ) ( they ( ( found ( ( no trace ) ( of explosives ) ) ) ( at ( the ( crash sites ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP FBI)) (VP (VBD told) (NP (PRP us)) (SBAR (S (NP (PRP they)) (VP (VBD found) (NP (NP (DT no) (NN trace)) (PP (IN of) (NP (NNS explosives)))) (PP (IN at) (NP (DT the) (NN crash) (NNS sites))))))) (. .)))
The FBI didn't find explosives in the wreckage.
( ( The FBI ) ( ( ( did n't ) ( ( find explosives ) ( in ( the wreckage ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP FBI)) (VP (VBD did) (RB n't) (VP (VB find) (NP (NNS explosives)) (PP (IN in) (NP (DT the) (NN wreckage))))) (. .)))