Officers investigating the incident sealed off part of The Moor last night for crime scene enquiries to be carried out.
It is expected that CCTV cameras on and around The Moor will be checked over the weekend for footage of the incident and those involved.
South Yorkshire Police said: “It is understood that the teenagers, believed to be 17-years-old, were assaulted by persons unknown on The Moor Sheffield.
“Their injuries are not life-threatening.
“An investigation is under way into the circumstances.”
Anyone with information should call 101 and quote incident 745 of June 6.
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