A 17-year-old boy has been stabbed to death during a confrontation between two groups of youths behind a high school in Sydney’s north-west, with a 15-year-old boy arrested over the alleged attack.

Emergency services, including a CareFlight helicopter, were sent to a park near Rouse Hill High School at 4.20pm following reports the boy had been stabbed in the leg. Paramedics frantically attempted resuscitation on the teenager, but he died at the scene.

Hills Police Area Commander Naomi Moore described the teenager’s death in Beaumont Hills on Monday afternoon as “senseless”, saying he and a friend were approached in the reserve on Caballo Street by a group of two to three young people before a knife was produced.

“I have 17-year-olds at home. This has impacted the core of the community. I have no other words but it’s a tragedy, and it’s senseless,” she said.

Moore said several female witnesses rendered aid to the 17-year-old during the “horrifically confronting” situation.

Police arrested the 15-year-old about 7pm on Monday after he presented to a local police station with a parent, and he is assisting with their inquiries.

Moore said there were no apparent links to Rouse Hill High School, or that it was gang related. Police will continue searching for one or two other people who they believe can assist with investigations.

Police received reports two people, believed to be teenagers, were seen fleeing the scene. One of them was believed to be wearing a school uniform.