(S (S (BASENP (DT This) (NN blast)) (VP (VBZ has) (VP (VBN been) (VP (VP (VBN blamed) (PP (IN on) (NP (NP (BASENP (DT the) (NNP Liberation) (NNPS Tigers)) (PP (IN of) (BASENP (JJ Tamil) (NNP Eelam)))) (PRN (LRB -LRB-) (BASENP (NNP LTTE)) (RRB -RRB-))))) (PP (IN by) (BASENP (NN government) (NNS officials))))))) (PERIOD .))