Officers are urging people to keep an eye out after a series of burglaries from garages around Illingworth in Halifax.
They say several garages in secluded areas have had their padlocks cut off, or handles snapped, by thieves trying to get inside.
The attacks have been happening late evenings.
Police are urging anyone who owns or rents a garage to check them regularly and review their security.
Increased police patrols in the areas are also being carried out.
Anyone with information should call Halifax North and East neighbourhood policing team via 101.