Thieves drove a dumper truck through a fence after stealing power tools from a building site in Kettering.
The burglary happened sometime between 4.30pm on Saturday (June 11) and 6.45am on Monday (June 13), at the Westhill site in Northampton Road, next to the A14.
The offenders entered the site and forced open three containers, stealing a number of commercial power tools.
They also caused thousands of pounds worth of damage to construction vehicles and drove a large dumper truck through security fencing.
Officers are appealing for witnesses and anyone with any information is asked to Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555111.