Bows and arrows have been stolen from Wrenn School in Wellingborough.
The burglary took place sometime between 8.45pm on Wednesday, July 17, and 6.40am on Thursday, July 18, when offenders forced their way into a secure storage facility.
They stole 12 bows and approximately 100 arrows.
Police would like to speak to anyone who witnessed the break-in or who has any information regarding it.
Officers would also like to speak to anyone who has been offered any of these items for sale.
Although stored at the school, the bows and arrows belong to an independent archery club.
Anyone with information about the theft can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.