(S (S (BASENP (DT This)) (VP (VBZ is) (VP (VBN believed) (S (VP (TO to) (VP (VB be) (NP (BASENP (DT the) (NN cause)) (PP (IN of) (NP (BASENP (JJ virus-induced) (NNS leaks)) (PP (IN from) (BASENP (BASENP (DT the) (NN police)) (CC and) (BASENP (NNP Defense) (NNP Agency))))))))))))) (PERIOD .))