(S (S (PP (IN In) (SBAR (WHNP (WP what)) (S (VP (VBZ is) (VP (VBN presumed) (S (VP (TO to) (VP (VB be) (NP (NP (BASENP (DT an) (NN attempt)) (PP (IN by) (BASENP (JJ dissident) (NNPS Republicans)))) (SBAR (S (VP (TO to) (VP (VB derail) (BASENP (DT the) (NN peace) (NN process))))))))))))))) (COMMA ,) (S (BASENP (NNP Pc) (NNP Stephen) (NNP Carroll)) (VP (VBD was) (VP (VP (VBN shot) (PP (IN in) (BASENP (DT the) (NN head)))) (PP (ADVP (RB just)) (PP (IN before) (NP (BASENP (NN 10:00) (NN p.m.)) (PP (IN on) (BASENP (NNP March) (NN 9)))))))))) (PERIOD .))