A shop worker was stabbed while trying to apprehend a thief who stole a charity box.
South Yorkshire Police said the incident took place in the Firth Park area of Sheffield on Wednesday morning.
A 40-year-old woman was arrested on suspicion of assault and robbery and remains in police custody.
The victim, a man in his 20s, was taken to hospital with serious injuries not believed to be either life-threatening or life-altering, the force said.
