RIDGEWOOD — Authorities are investigating a pair of fights last weekend, captured on video by onlookers, that sent at least one Ridgewood High School student to the hospital.

Ridgewood police put out a request for witnesses to two fights that occurred on Stevens Field and then on Brookside Field.

Chief Jacqueline Luthcke said that at 8:15 p.m. on Sunday, officers received a call that an altercation had taken place earlier that weekend. Cars were not dispatched to the scene, she said, as the caller intimated the incident had occurred much earlier.

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Luthcke could not comment on how many actors or victims were involved, nor the exact time of the incident or what instigated the row, saying, "This is still under investigation. We don't want to put out any incorrect information."

A Facebook post on a Ridgewood alumni group page, written by a relative of the victim and widely shared on social media, said the boy had been hospitalized with a fractured skull and was at risk of losing sight in one eye.

As Ridgewood High School broke for lunch Friday, some students spoke anonymously about what they had heard happened, which, based on the police statement and one student's account, involved two separate fights, on Oct. 27 and 28.

"It was over two days," said the student, who spoke on a condition of anonymity. "That's just what I hear."

A senior who declined to give her name said that her understanding was that a freshman possessed nude pictures of a fellow student's girlfriend, a junior.

"They were supposed to fight," the senior said Friday, "but the freshman knocked him out in one punch." She also said that she was not present at the altercation.

An email sent to parents Friday, from Daniel Fishbein, superintendent of Ridgewood schools, said the "serious incident" occurred after hours on school property and that anyone found to have participated could face "legal proceedings, school discipline and/or counseling."

It also said, "it is important to address and dispel rumors that are circulating in the community."

The email followed reports on social media that the student had been beaten unconscious while scores of others watched and even videotaped the incident.

The Facebook post on the alumni page described the incident as follows:

"At RHS this past weekend a boy stood up for a girl who is being harassed, and told to kill herself after photographs of her were passed around on social media. He then gets massively bullied and harassed in social media, and then put in the hospital for two and a half days, with surgery to follow."

In the letter to parents, Fishbein said "students were present who videoed the incident rather than attempted to intervene."

Luthcke has asked that any witnesses come forward, and contact Detective Jeffrey Casson at 201-251-4537 or by email at jcasson@ridgewoodnj.net.

Email: katzban@northjersey.com.