(S (S (BASENP (JJ Interim) (NNP President) (NNP Rose) (NNP Francine) (NNP Rogombe)) (VP (VBZ says) (SBAR (S (BASENP (DT an) (NN investigation)) (VP (VP (VBZ is) (PP (IN under) (BASENP (NN way)))) (S (VP (TO to) (VP (VB determine) (SBAR (WHNP (WP who)) (S (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (BASENP (DT that) (NN violence))))))))))))))) (PERIOD .))