The father of 1-year-old twins who died Friday after the police said he had left them in a hot car was charged with manslaughter and criminally negligent homicide.

The father, Juan Rodriguez, 39, of New City, N.Y., was arrested and charged late on Friday, the police said. He left the children inside a parked silver Honda Accord in the morning in the Bronx and reported for his job at the James J. Peters V.A. Medical Center, officials said.

It was unclear why he had left the babies, a boy and a girl, alone in the car. Hours later, Mr. Rodriguez left his job, got in the car and drove a short distance before realizing they were inside, the police said. He jumped out and screamed.

A passer-by called the police. When officers arrived, they discovered that the infants, identified as Mariza and Phoenix Rodriguez, were both dead.