A touring caravan parked in a layby near Market Harborough was destroyed in an arson attack just after midnight.
It's the second such incident in the area in the past few days.
The caravan involved in the latest incident was parked in Gallowfield Road, off the A6 on the outskirts of the town when it was deliberately set alight.
A crew from Market Harborough dealt with the blaze and had to call for a second fire engine for additional water supplies.
On Tuesday firefighters were called to a touring caravan deliberately set alight outside Justin Park caravan site, in Northampton Road.