Baseball bats were used in an early morning attack on three teenage boys in Farnborough, which left them with broken bones.
Detectives are appealing for information after a 15-year-old and two 17-year-olds from Surrey were assaulted by a group of as many as eight other teenage boys in the Farnborough Rugby Club and Shelley Rise area at around 1am on Friday.
It is believed the victims had met a group of girls at Farnborough railway station earlier that night, and were then confronted by the group of assailants near to the playing fields at the rugby club.
One boy also had cash and a bank card stolen and another had a bag containing a tablet device taken.
The victims sustained numerous injuries, including broken bones, and all received hospital treatment.
Detective Constable Sam Adcock said: "Were you in the area at the time? Did you see groups of teenage boys or any altercation?
"It is believed these boys are all known to each other, so I would like to reassure the local community that this is an isolated incident and there is no wider threat to their safety.
"I’d like to hear from anyone who has information which may assist this investigation."
A 15-year-old boy from Farnborough has been arrested.
Anyone with any information is asked to contact Aldershot CID on 101 or call Crimestoppers anonymously on 0800 555111.