Police discovered a motobike which had been set alight at the Netley recreation ground at around 8:35pm this evening.
Hampshire Fire and Rescue were called to put out the fire and have confirmed that three similar incident have been dealt with this evening involving motobikes being set alight.
A small group of teenagers were seen running from the scene but due to the darkness they could not be identified.
The fire from the bike has caused extensive damage to the wooden wall which it was propped up against.
Police are asking members of the public or any other potential witnesses or CCTV which might assist the investigation.
Call 101 or visit the police website reference 44200402978.