A brawl that broke out between students and a parent is under investigation.

York Region Police are seeking witnesses following a fight that occurred at Briar Nine Park near Cardinal Carter Catholic High School.

According to police, a group of students gathered at the Oak Ridges park for a fight Dec. 2 at 3 p.m. Police believe the fight was between a Cardinal Carter student and a St. Theresa of Lisieux Catholic High School student.

During the bloody brawl, a parent of one of the students joined in.

A cellphone video of the fight that has been circulating on social media shows two teens exchanging blows and when taunted, the parent retaliates with a fist, which spurs another fight in which he receives and throws punches. At one point, the graphic video shows the man sitting on the ground as a number of teens continue to hit him, including a kick to the head, before one student rushes in attempting to shield him from further harm.

“Investigators are aware of the videos of the fight which have been circulating on social media,” YRP said in a statement.

A second video surfaced shortly after showing another scuffle among a group of teens and then the same parent duking it out with another teen.

"The York Catholic District School Board takes these incidents very seriously and the safety of all students is our priority," the board said in a statement. "The board, together with school administration is committed to working with YRP to investigate and to determine the various students' level of involvement."

YCDSB said it will use the Ontario Safe Schools Act to determine the appropriate consequences for those involved. Support staff from the board's psychology and religious education departments are at the school to assist students who may have questions or concerns.

While charges have not been filed by participants of the incident, that doesn’t mean charges can’t still be laid, according to YRP.