Police are investigating what caused a that destroyed nine vehicles near Boston.
Seven caravans and two cars were damaged in the blaze in Wrangle, near Boston at around 11pm on Thursday, January 3.
It is not clear if anyone was injured in the fire, which was extinguished using two hose reels, two main jets and four breathing apparatus.
Lincolnshire Police are looking to speak to anyone who saw suspicious people or vehicles near to the fire.
Contact the force on 101, quoting incident 420 of January 3 if you witnessed anything.