A teenager was seriously injured in a stabbing in Sheffield city centre.
The 17-year-old and a man in his 20s were attacked in Hartshead Square at around 7.30pm on Monday.
South Yorkshire Police said a group was involved in a fight.
Two teenage boys, also aged 16 and 18, have been arrested on suspicion of wounding.
A South Yorkshire Police spokeswoman said: "Police were called to reports of a a group fighting in the Hartshead Square area.
"A 17-year-old boy and man in his 20s were taken to hospital with suspected stab wounds.
"Two teenage boys have been arrested on suspicion of wounding and are being questioned by detectives."
Witnesses or anyone with information should call South Yorkshire Police on 101.