A teenage boy is in hospital after he was attacked in a Chesterfield park.
The 17-year-old was injured in an incident in Queen's Park yesterday afternoon.
Officers found him after being called to the park at 4.25pm.
He was taken to hospital, where his condition today is stable.
An 18-year-old man and a 17-year-old boy, both from Chesterfield, have been arrested on suspicion of causing grievous bodily harm.
Witnesses to the incident or anyone with information should call Detective Sergeant Justin Redman at Derbyshire Police on 101.
Crimestoppers can be contacted, anonymously, on 0800 555111.