(S (S (PP (IN On) (NP (BASENP (NNP June) (NN 2)) (COMMA ,) (NN 2000))) (COMMA ,) (S (NP (BASENP (DT a) (JJ serious) (NN accident)) (PP (IN in) (NP (BASENP (DT the) (NN province)) (PP (IN of) (NP (BASENP (NNP Cajamarca)) (PRN (COMMA ,) (PP (IN in) (BASENP (NNP Peru))) (COMMA ,))))))) (VP (VP (VBD poisoned) (BASENP (JJ many) (NNS residents))) (PP (IN with) (NP (BASENP (NN mercury)) (COMMA ,) (BASENP (DT a) (ADJP (RB highly) (JJ toxic)) (JJ heavy) (NN metal))))))) (PERIOD .))