(S (S (BASENP (NN Law) (NN enforcement)) (VP (VP (VBZ does) (RB not)) (VP (VB believe) (SBAR (S (BASENP (DT the) (NN accident)) (VP (VBD was) (NP (BASENP (DT the) (NN result)) (PP (IN of) (NP (BASENP (NN terrorism)) (CC or) (BASENP (JJ criminal) (NN activity))))))))))) (PERIOD .))