Two cars were set alight 150 metres apart in Foxhill Crescent at 3.30am this morning (Saturday May 30).
Firefighters from Rivelin attended the incident and found a VW Golf and a Vauxhall Combo alight.
The VW Golf vehicle had engine damage as a result of the blaze and the Vauxhall had fire damage to the drivers seat and smoke damage.
Firefighters believe the incidents were deliberate.
Investigations are continuing.