(S (S (S (BASENP (DT An) (NN investigation)) (VP (VBZ has) (VP (VBN been) (VP (VBN launched) (PP (IN by) (NP (NP (BASENP (DT the)) (NP (BASENP (NNPS Prisons)) (CC and) (BASENP (NNP Probation) (NNP Ombudsman)))) (COMMA ,) (ADJP (JJ responsible) (PP (IN for) (S (VP (VBG investigating) (NP (BASENP (NNS deaths)) (PP (IN in) (BASENP (NN custody)))))))))))))) (CONJP (COLON ;) (CC but)) (S (BASENP (NN suicide)) (VP (VBZ is) (VP (VBN suspected))))) (PERIOD .))