(S (S (S (NP (BASENP (DT The) (ADJP (RBS most) (JJ recent)) (NN ceasefire)) (PRN (COMMA ,) (PP (IN in) (BASENP (NN 2006))) (COMMA ,))) (VP (VBD led) (PP (TO to) (NP (BASENP (NN peace) (NNS talks)) (PP (IN between) (NP (BASENP (DT the) (NN group)) (CC and) (BASENP (DT the) (JJ Spanish) (NN government)))))))) (CONJP (COMMA ,) (CC but)) (S (BASENP (PRP they)) (VP (VBD were) (VP (VBN interrupted) (PP (IN by) (NP (BASENP (DT a) (NN car-bombing)) (PP (IN at) (NP (BASENP (NNP Madrid) (POS 's)) (BASENP (NNP Barajas) (NNP Airport)))))))))) (PERIOD .))