Police officers called to a brawl in Sheffield city centre spoke to those involved but nobody wanted to report a crime.
A member of the public reported the High Street incident to South Yorkshire Police at around 1.40pm yesterday.
A police spokeswoman said: "A member of the public reported two people fighting.
"Upon arrival, the individuals concerned did not wish to report any crime and nobody was injured.
"A 17-year-old boy was interviewed under caution in connection with the incident and enquiries are ongoing."