(S (S (BASENP (DT The) (JJ state-run) (NNP Xinhua) (NN news) (NN agency)) (VP (VBZ says) (SBAR (S (NP (BASENP (DT the) (NN cause)) (PP (IN of) (BASENP (DT the) (NN disaster)))) (VP (VBZ is) (PP (IN under) (BASENP (NN investigation)))))))) (PERIOD .))