(S (S (BASENP (DT The) (NN fire)) (VP (VBZ is) (VP (VBN considered) (NP (BASENP (DT the) (JJS worst) (NN accident)) (PP (IN in) (NP (BASENP (DT the) (NN country) (POS 's)) (BASENP (NNP jail) (NN history)))))))) (PERIOD .))