DARTMOUTH, N.S. -- The discovery of a local fight club has prompted police in Dartmouth, N.S., to tell parents to have a chat with their high school-aged kids about the dangers of fighting.

Police learned Tuesday that videos of a group called the Northbrook Fight Club had been posted to YouTube.

Const. Brian Palmeter of the Halifax Regional Police watched one of the videos, allegedly shot at the local Northbrook Park, which showed two teens fighting mixed martial arts-style while about 20-30 young people watched.

"I was very concerned," said Palmeter. "Within the first minute ... one of the boys goes down hard on his head."

"It was alarming," he added.

When Palmeter watched the boy fall, he immediately thought about two fatal fights involving adults in the past year, and how easily a scrap can turn deadly.

"It doesn't take much when it comes to head trauma," he said.

That's why it's important parents talk to their kids, he said. It's also why police plan to investigate further, talk to local schools, and possibly put out more patrols in the area.

The videos have since been taken down from YouTube.

Not only should teens be reminded of the physical dangers of fighting, they should also be aware of the potential legal consequences -- no matter whether a fight is consensual.

"You can't legally agree to be injured," he said, adding that if someone is injured in a fight, police could lay charges.

Several students and a recreation facility employee at the University of Manitoba were disciplined last month after at least one fight was held in a campus squash court late last year.

Recreation centre staff learned of the fight after someone noticed men exiting the courts with bloodied faces and then discovered a Facebook page where members discussed the fights at the facility.

In 2006, police in Corner Brook, Nfld., said they'd uncovered a fight club involving 150 teens.

Fight clubs initially seemed to pop up in the news after the 1999 release of the film Fight Club, starring Edward Norton and Brad Pitt.

The most recent cases emerge as the sport of mixed martial arts -- particularly its largest promotion, the UFC -- has become one of the fastest growing sports in North America.