"Obviously we are upset with what we saw in the video, both as parents and police officers," Chatterton told reporters during a press conference Thursday afternoon. "But at this time, she has decided she does not want to press criminal charges."

In New York, Chatterton said in order to charge a 13-year-old in Family Court, the alleged crime must a misdemeanor or a felony. Harassment is a violation and does not meet that threshold, he said.

"So we're still working ... on whether it rose to the level of a crime," he said, adding that Klein has expressed she'd prefer if school officials mete out punishment.

The four boys seen in the video have not denied their role in the incident, Chatterton said. Investigators have spoken to all four of them, as well as their parents.

"No one has denied accountability," he said.

Greece Central School District officials, meanwhile, promised to discipline the four students to the "fullest extent" allowable following an extensive investigation.