Emergency services were called to a series of arsons in the early hours of Saturday morning (November 17) in Littlehampton.
At 12.30am a tree was found alight in Admirals Walk which is believed to have been set on fire deliberately.
Five minutes later at 12.35am emergency services were called to the footpath behind a block of flats on Greenfields to a car which was alight.
The Hyundai Coupe had been stolen from Potters Mead and was completely burnt out.
A 30ft pine tree was set on fire at Honeysuckle Close at 1.15am and another tree was also set fire to in Brookfield Park, Worthing Road at 1.20am.
Sergeant Roy Hodder said: “We are obviously concerned about the risks of these fires but we are working closely with West Sussex Fire and Rescue to target the area. We are linking all these fires and are appealing to anyone who saw or heard anything in the area to call police on 101 quoting Operation Aspro.
“We are urging people to take care of their cars properly by making sure they are always secure and using a steering lock. We also remind people to remove all valuables from their cars like Sat Navs and CDs. Don’t make your vehicle an easy target.
“Please keep an eye out for any suspicious behaviour and call the police immediately on 999, if the crime is taking place, or 101 with any information.”