(S (S (S (BASENP (PRP It)) (VP (VP (VP (VBZ is) (RB not)) (ADJP (JJ clear))) (SBAR (WHNP (WP who)) (S (NP (BASENP (DT the) (NN leader)) (PP (IN of) (BASENP (DT the) (NN coup)))) (VP (VBZ is)))))) (COMMA ,) (SBAR (IN although) (S (BASENP (JJ several) (JJ military) (NNS sources)) (VP (VBD said) (SBAR (IN that) (S (NP (BASENP (NNP Major) (NNP Adamou) (NNP Harouna)) (PP (IN of) (BASENP (DT the) (JJ Nigerien) (NNP Army)))) (VP (VBD was) (ADJP (JJ responsible))))))))) (PERIOD .))