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The Bronx district attorney’s office said on Thursday that it had not yet presented evidence to a grand jury in the case of a Rockland County father who left his year-old twins in his car for eight hours, causing them to die of heatstroke.

Prosecutors said in court that their investigation into the children’s deaths was not complete, raising the possibility that the charges against the man, Juan Rodriguez, could be reduced or dropped.

Mr. Rodriguez, 39, who left his twins in his hot car while he went to work at a Bronx hospital last week, was charged on Saturday with two counts each of manslaughter, criminally negligent homicide and endangering the welfare of a child. Mr. Rodriguez has told the police it was a tragic mistake.

“I assumed I had dropped them off at day care before I went to work,” he said, according to court documents. “I blanked out. My babies are dead.”