A safe was stolen from a village school during the Bank Holiday weekend.
Pytchley Church of England Primary School in High Street, Pytchley, was broken into sometime between 6pm on Friday, May 2, and 7am on Tuesday, May 6.
A police spokesman said: “The thieves prised open a window to get into the building.
“Once inside, they took a locked safe from an office.”
Witnesses or anyone with any information about the theft can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.