What police describe as "a significant amount" of Stanley knife type blades and broken glass have been left on land in Tintwistle.
Glossop Police's Safer Neighbourhood Team say they have received reports of them being left on land adjacent to the Disabled Pier at Valehouse Reservoir.
Police believe it has happened in the same place on several occasions and is appealing to the public for information.
Anyone who can assist is asked to get in touch via the below methods, quoting the officer in the case PCSO 4415 Buller and occurrence number 2000486566.
- Facebook - send a private message to/DerbyshireConstabulary
- Twitter - direct message the contact centre @DerPolContact
- Website - complete the online contact form at http://derbyshire.police.uk/Contact-Us.
- Phone - call 101
You can also call Crimestoppers anonymously on 0800 555 111.