Fire crews were called out at 11.50pm to extinguish several vehicles set ablaze in Little London, Newport, last night (Thursday).
Firefighters using breathing apparatus, foam and a hose reel jet, tackled fires to a BMW motorbike and a Dodge Nitro.
But two other vehicles — a Suzuki Grand Vitara and a Land Rover Discovery — were also damaged by fire.
Police say they were called at 11.58pm to a report of a suspected arson attack.
Anyone with information is asked to contact the Hampshire and Isle of Wight Constabulary on 101, quoting the crime reference number 44240133062.