Northants Police is appealing for information following a burglary at a building site in Belle Baulk, in Towcester.
The incident happened between 2pm on Saturday, November 30, and 7.30am this morning, Monday.
The offenders entered a secure building site by damaging some fencing. Once on the site they broke a lock securing a tool container and stole the tools from within.
They also broke into a fuel container but were unable to remove the fuel.
Three men were seen in the compound at around noon on Sunday, with a blue Ford Transit van with an orange flashing light on the roof. A member of the public alerted the show home to this suspicious activity and police are urging this person to come forward as they may be able to offer vital information to help officers in their investigation.
Anyone with information, should call Northants Police on 101 or Crimestoppers anonymously on 0800 555111.