About 5,000 litres of red diesel has been stolen from a farm yard near Horbling.
It happened between 5pm on Sunday and 8am on Monday, with police suspecting that two or more vehicles may have been used.
Anyone who saw any suspicious vehicles in the area should call 101, quoting incident 190 of January 12.
Meanwhile, a so-called “lock-snapping” burglary took place at a house in Westbourne Park, Bourne, in the past week.
It happened when a gang got in by breaking the lock cylinder on the door.
If calling 101, you should quote incident 144 of January 14.