Several police cars, two ambulance vehicles and the Yorkshire Air Ambulance were called out to Lowedges at about 8pm this evening.
The Yorkshire Air Ambulance also landed in nearby Greenhill Park.
An eyewitness said: "There are loads of police and ambulances here.
"I have heard that a teenage male has been stabbed and taken away in the air ambulance.
South Yorkshire Police and Yorkshire Ambulance Service has been contacted for comment and we are awaiting a reply.