An 18-year-old had his skateboard stolen by a gang who then beat him up.
The incident happened at around 2.15pm on Wednesday at the Skate Park in Vale Park, Aylesbury.
A skateboard belonging to the victim was stolen along with Mini rig stereo speakers, which were gold and had a sticker on the side whith the words ‘Slam City’ written on it.
A group of five men – two Asian and three white, all aged between 18 and 20 - then assaulted the victim, leaving him with a broken nose and bruising.
PC Nicola Ambrose said: “We would urge anyone who was in or near the skate park at the time and may have seen anything to do with this incident is asked to contact us as a matter of urgency.”
Anyone with information is asked to contact PC Ambrose via the Thames Valley police enquiry centre on 101.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.