Thieves stole chemicals and tools from a warehouse on a Northampton industrial estate.
Sometime between 1.30pm on Saturday and 5.30am yesterday (Tuesday) offenders entered the premises in Bunting Road industrial estate and stole the items.
A police spokesman said: “It is possible that they may have entered the property on two separate occasions between the suspected dates and either used the fire escape exit to the rear of the property or entered through the roof.”
Anyone with information can contact Northamptonshire Police on 101. Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.